1. 轻拍;轻触;轻拭;轻敷;轻涂
If you dab something, you touch it several times using quick, light movements. If you dab a substance onto a surface, you put it there using quick, light movements.
2. (表面的)少量,少许,一点儿
A dab of something is a small amount of it that is put onto a surface.
3. 孙鲽;黄盖鲽
A dab is a small flat fish with rough scales.