The difference between Pester and Pick at
When used as verbs, pester means to bother, harass, or annoy persistently, whereas pick at means to touch, grab, handle, or pull tentatively or gingerly, using a utensil or one's fingers.
Pester is also noun with the meaning: a bother or nuisance.
check bellow for the other definitions of Pester and Pick at
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Pester as a verb (transitive):
To bother, harass, or annoy persistently.
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Pester as a noun:
A bother or nuisance.
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Pick at as a verb (transitive, idiomatic):
To touch, grab, handle, or pull tentatively or gingerly, using a utensil or one's fingers.
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Pick at as a verb (transitive, idiomatic):
To pick on or repeatedly criticize (someone).