ちゃう Common word Show inflections LinksSentence search for ちゃうSentence search for じゃうEdit in JMdict Auxiliary verb, Godan verb with 'u' ending1. to do completelycontraction of ..て or で plus しまうAuxiliary verb, Godan verb with 'u' ending2. to do accidentally; to do without meaning to; to happen to doOther formsじゃう Discussions Log in to talk about this word.