Jisho

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Adverb taking the 'to' particle, Adverb (fukushi), Suru verb, Noun which may take the genitive case particle 'no'
1. being afraid of; being fearful; being timid; being nervousOnomatopoeic or mimetic word
Adverb taking the 'to' particle, Adverb (fukushi), Suru verb, Noun which may take the genitive case particle 'no'
2. trembling; shiveringOnomatopoeic or mimetic word
Other forms
びくびく

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