Also means
to chip away at, to erode
Usage Note
Grignoter describes small repeated biting motions — grignoter des biscuits (to nibble biscuits). Figuratively it means to gradually eat into something, as in grignoter des parts de marché (to nibble away at market share). The noun grignotage means snacking.
Examples
"Elle grignote des noix en regardant la télé."
Natural Translation
She nibbles nuts while watching TV.

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