Undertow 
To dream of noticing a strong undertow is an alert that you may be being sucked into a significant emotional drama. However, there is time to step back and not get caught up in another person's boring choices.
To dream of being caught by an undertow and being out of control implies that you may now have to accept your part in an emotional drama before finding a way to breathe and walk away.
Underwear
To dream that you are in your underwear represents a condition that has formed a loss of reverence for yourself. On the other hand, it may even represent some facet of your private life. If you feel guilty about being seen in your underwear, then the dream indicates that you have some hesitance about revealing your true viewpoints, hidden ideas/behavior, and thoughts.
To dream that someone other than you is in their underwear represents a curious and awkward situation. You may even see that person for who they really are.
To see tattered or sullied underwear represents that you aren't comfortable with yourself and may have some feelings of failure. You may even have critical and negative feelings about yourself. You may feel uneasy regarding your sexuality
Undertaker
To dream of an undertaker signifies your need to take control of the responsibilities in your life.
Underwater
To dream that you are underwater represents that you are overcome with emotions and need greater organization in your life. You may even be over your head in some circumstances.
To dream that you are breathing underwater signifies a withdrawal back into the womb. You yearn for a chance to return to a position where you were liberated from responsibilities. Maybe you were feeling unable to provide for your own needs and caring about yourself. You may even be inundated in your own sentiments.
Undercover
To dream of being undercover indicates an unwillingness to reveal everything about yourself in a current friendship. Be true to your feelings as there may be a reason you are holding back.
Understudy
To dream of being the understudy in a play or production is a sign that you are the only one standing in the way of a possible successful future. There is an implication that you may need to grow in confidence and put yourself out there a little more to achieve your ultimate success.
Underground
To dream that you are living underground signifies a loss of status, wealth, and the longing for a greater piece of mind and sanctuary. You may be placing these matters and thoughts into the subliminal part of your mind.
To dream while you are riding in an underground railroad represents anguish and concern rising up from an unusual activity.
Bed
To dream of your bed symbolizes a realization of your sexual needs and desires. You are becoming aware of your needs. If you are sleeping in your own bed then it implies that you feel comfortable and at ease. You are seeking happiness and solace in your home life. If you are waking up in different and/or unknown beds then it symbolizes the end results of your choices.
To dream that you are searching for a bed signifies your struggles to accept your inner sexuality. You are bothered by restrictions and limitations that you feel have been placed on you. It may also imply that you seek comfort and bliss at home.
To dream that you are going to bed with a stranger implies that you are too trusting and accepting of others. You need to slow down and scrutinize people before allowing them access to your inner feelings.
To dream that you are floating or lifting up into the air from your bed indicates your feelings of isolation and loneliness. Perhaps your character is too forward and intense for others to handle. You should relax a bit and try not to be too pushy with your beliefs and attitudes.
Vex
To vex or be vexed in a dream symbolizes conflict. You are likely struggling with problems that are causing you such great stress that you are unable to relax while you are asleep.
Nazi
To dream of a Nazi symbolizes an impossible resolve in dealing with a wicked and ruthless force. This may lead to feelings of inferiority as a result of other people's cutting remarks.
Ranch
To dream that you are at a ranch means that you must take control of and accountability for your life and goals. The dream may also be closely linked to your own occupation and concerns about your finances.
Begin
To dream that you are beginning to do something shows that you have been putting something off. It means that you need to move forward and be more diligent and timely.
Brain
To dream of your brain indicates that you are suffering emotional torment. It may also mean that you should utilize your wisdom to resolve a conflict or difficulty. In addition, this dream may be stating that you are not being adequately credited for your concepts and suggestions. Perhaps the messages you are trying to convey are being taken in the incorrect context.
Abject
To dream that you are abject signals financial changes. If the abject feeling improves during the dream, it means that the changes won't be permanent. But, if you react positively to the abjectness, it means that significant financial rewards are coming.
Knight
To dream of a knight symbolizes protection and security. The knight embodies a savior or someone who sweeps you off your feet, as in the phrase, 'knight in shining armor.'
Tunnel
To dream of a tunnel represents the main female reproductive organ, the womb, and giving birth. Hence, it may indicate your need for protection and nurturing.
To dream that you are going through a tunnel suggests that you are discovering parts of your unconscious. You are in the process of gaining understanding and enlightenment. Alternatively, it may indicate your myopic nature.
To see light at the end of the tunnel symbolizes hope and a brighter future.
Bonnet
To dream about seeing or wearing a bonnet symbolizes cloistered and quaint thoughts and beliefs. Your stubborn mindset is hampering plans for the future.