Simple past tense and past participle of nibble.(verb)
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Use "nibbled" in a sentence
"It was reduced to a kind of nibbled cheese rind, and it always disappeared before we expected it to."
"Hillary warned that you have to go in with the strongest plan because you'll get "nibbled" to the point where you have an ineffective plan otherwise."
"But it just kind of nibbled at me that it's marketed to young kids."