Removing things that are unwanted or harmful from your consciousness or life (such as judgments, self-defeating beliefs, or toxic relationships).
Because a sink is where you clean up after yourself or your family, it can represent “cleaning up after” (such as taking responsibility for past decisions, direction, and actions, and “cleaning up” any resulting “messes”).
A kitchen sink filled with dirty dishes can represent a catch-all (such as someone who takes on other people’s problems), or neglected responsibility.
A bathroom sink might represent: your mental or emotional “cleanliness” (such as conscientiousness, integrity, or a non-judgmental attitude), a personal process, your way of thinking, relating to yourself, making decisions, etc.
(since the bathroom sink is used for day-to-day personal maintenance).
See also: Cleaning, Water, Faucet, Soap, Drain, Bathtub or Shower, Bathroom [1]
The fact that it is a structure that helps move water connects it with the world of feelings and emotions. Consider the type of sink and the state that it is in; both should be utilized in your interpretation.
A bathroom sink relates to matters of intimacy and privacy.
A kitchen sink connects to how well you are engaged in self-care. An industrial sink has more to do with your social experience. [2]
If you dream of something that sinks to the bottom of the ocean, then your dream is showing you where you are giving up and giving in.
If sinking into something, you are going down into the muck and mire of own emotional state. Stop and make changes; you are headed in the wrong direction. Release yourself of unnecessary burdens. [4]
If the sink was full of water, you may experience some family troubles or disappointment in love. However, if the sink was empty, your dream more likely has a positive meaning. [5]
A dirty sink might signal a need for a nutritional cleansing soon. [6]