If you or someone is a coward in a dream, then it shows how you are neglecting of who you are. Perhaps you do not let yourself to keep increasing.
Dream dictionary: Coward dream meanings
…To dream that a mask is covering your face suggests that you’re acting hypocritically or at least you’re hurting someone with your lies. To dream about other people that are wearing masks suggests that you may have opponents. Dreaming of attending a masquerade suggests that the dreamer likes trivial, false and ostentatious fun, vulgar pleasures and that he or she is an irresponsible person. To dream of masks has always been known as a warning against coward people that are trying to harm the dreamer, therefore, to dream about a mask, either if you see it hung or in any other place, is considered a warning. When a woman dreams about a masquerade or that she’s using a mask, it symbolizes that she enjoys being unfaithful….
…In a dream, a rabbit represents a coward man, a wife, an evil woman, or someone who talks continuously about unimportant matters. Eating rabbit meat in a dream means getting little money, or profiting from a woman. A rabbit’s foot in a dream represents superstition or a talisman….
(Colocynth | Bitter apples | Bitter cucumber) Its tree represents sadness and stress, a coward, or an uneasy, worried and a restless person.