What does びくびく mean?
びくびく is a Japanese adverb meaning “being afraid of; being fearful; being timid; being nervous” in English. It can also be translated as “trembling” depending on context. It is written as びくびく in hiragana, and bikubiku in romaji. This word is part of JLPT N2 vocabulary.
Example sentence
彼はびくびくしている。
He is afraid of his own shadow.