Meaning of the word "bob up" in English

What does "bob up" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

bob up

US /bɑːb ʌp/
UK /bɒb ʌp/
"bob up" picture

Phrasal Verb

to rise or appear suddenly or unexpectedly, especially to the surface of water

Example:
The cork bobbed up to the surface of the water.
New problems keep bobbing up every day.