A jar in a dream can be a symbol of feminine passivity. It holds things and protects them, but it does not move of its own accord and it may be fragile and easily broken.
Jars in dreams can symbolize motherhood. A jar in a dream can symbolize your attitude toward your mother, or it can represent your nurturing instincts. If you are a mother in real life, the jar and its contents can provide information about the type of mother that you think you are.
A jar with a top that is screwed on too tightly or that is overflowing can be a symbol of emotional smothering.
An empty jar can signify emotional neglect.
Sometimes a jar in a dream can symbolize being “jarred” or shaken up. Thus, a jar can appear in a dream after you have had a traumatic experience.