- 1[intransitive, transitive] to move or make something move quickly up and down, especially in water bob up and down Tiny boats bobbed up and down in the harbor. bob something (up and down) She bobbed her head nervously. The maid bobbed a curtsy.
- 2[transitive] bob something to cut someone's hair so that it is the same length all the way around Phrasal Verbsbob up
NAmE//bɑb//Verb Forms present simple I / you / we / they bob
he / she / it bobs
past simple bobbed
-ing form bobbing