keys provide access to things. in dreams, they may be sent from the unconscious to give you access to your true self, or the solution to a problem. an old man with keys represents deep inner wisdom. (ackroyd)

can indicate that there's a part of you or your life that feels dead, or that there's a part of you or your life that you wish would leave you alone for good. dreams of killing others or getting killed are not common. it might
indicate deeply unresolved issues that are plaguing your dreams and your waking life. (pliskin)

murdering someone in a dream may be expressing hidden anger or hatred towards that person. these dreams are common with siblings or partners with rocky relationships. (ackroyd)

killing a person or animal may be a symbol of your repression of an aspect of yourself. (ackroyd)

if the person you kill is of the opposite sex, this could mean that your contrasting sexual element is not getting its equal share of conscious involvement. (ackroyd)

a king could symbolize your father, or your image of him. he could also be a symbol of your self. (ackroyd)

a king and queen appearing together represents a union of opposites in the psyche (anima/animus, conscious/unconscious). if the king and queen are chess pieces, and the king is under threat by the queen, this signifies a strong attachment to the mother which stifles his independence. (ackroyd)

usually, a kiss is simply an expression of sexual desire. (ackroyd)

it could also be a symbol of bringing life to the neglected side of your personality (anima or animus). (ackroyd)

symbolizes deep destructive tendencies. (ackroyd)

a knot could be a symbol of a problem, either external or internal. (ackroyd)

also, a knot joins things together. in dreams, a knot could be a message asking you to reconcile internal forces that are causing internal conflict, so you can become whole. (ackroyd)