peck at
Upper Intermediate (B2)neutral
to do something little by little with small quick touches or bites
"She just pecked at her salad and said she wasn't hungry."
Hear it in context

Drs. Robert Epstein & BF Skinner with Pigeons-Part 1
drrobertepstein · 11:28
between her peck at the the hidden color

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the crow continues to like just peck at its at its back.

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TheSorryGirls · 2:38
I am going to peck at this grass with my free range abilities.

Drs. Robert Epstein & BF Skinner with Pigeons-Part 1
drrobertepstein · 11:24
harder still by introducing a delay between her peck at the the hidden color

Drs. Robert Epstein & BF Skinner with Pigeons-Part 1
drrobertepstein · 11:28
between her peck at the the hidden color and the availability of the color keys