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Definitions of dabber:
noun: A thing or person that dabs.
noun: Alternative form of dauber (“cushioned pad used for applying ink”) [(derogatory) One who, or that which, daubs; especially, a coarse, unskillful painter.]
noun: Alternative form of dauber (“marker pen used for bingo cards”) [(derogatory) One who, or that which, daubs; especially, a coarse, unskillful painter.]