JACK OF ALL TRADES

n. , informal (Often followed by the words "master of none.") A person who is knowledgeable in many areas. Can be used as praise, or as a derogatory remark depending on the context and the intonation. Peter is a jack of all trades; he can survive anywhere! "How come Joe did such a sloppy job?" Mary asked. "He's a jack of all trades," Sally answered.