laplap2 verb (lapped, lapping) 1 [intransitive, transitive] if water laps something, or laps against something, it touches something with small waves: Listen to the sound of the lake lapping against the shore.2[transitive] also lap up to drink using quick movements of the tongue: a cat lapping milklap up phrasal verb disapproving to enjoy or believe something without criticizing or doubting it at all: She’s flattering him and he’s just lapping it up!