こそこそ Common word LinksSentence search for こそこそSentence search for コソコソEdit in JMdict Adverb (fukushi), Adverb taking the 'to' particle, Suru verb1. sneakily; secretly; stealthily; on the slyOnomatopoeic or mimetic word, See also こっそりOther formsコソコソ Discussions Log in to talk about this word.