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Synonyms

bob up

Idioms  
  1. Appear suddenly or unexpectedly. For example, I didn't know anyone in the group until Harry bobbed up. This term uses the verb bob in the sense of “to bounce,” a usage dating from Chaucer's day. [Late 1800s]


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

“That’s the reason why we’ve seen prices basically bob up and down.”

From The Wall Street Journal ● Feb. 27, 2026

Their heads and necks will bob up and down, more closely resembling lances drawn and thrust in a medieval battle than silly birds comically bumbling around.

From Salon ● Nov. 25, 2022

Songs organically bob up from the instrumental score, which grooves along with repetitive patterns, broken waltzes and echoes of the song melodies.

From Los Angeles Times ● Dec. 1, 2021

How many times a minute does a boat bob up and down on ocean waves that have a wavelength of 40.0 m and a propagation speed of 5.00 m/s?

From Textbooks ● Aug. 12, 2015

I watch her flashlight beam bob up and down with her footsteps.

From "Allegiant" by Veronica Roth

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