pickcalm down . calm down {v. phr.} To become quiet; relax. "Calm down, Mr. Smith," the doctor said with a reassuring smile. "You are going to live a long time." Categories: add yours time verb Source: A Dictionary of American Idioms 'calm down' on video Rema - Calm Down (Official Music Video) Rema - Calm Down Rema - Calm Down Rema - Calm Down (Lyrics) sort: relevance, mode: exact match, q: "calm down", maxResults: 4, videoEmbeddable: true, videoSyndicated: true, safeSearch: strict, type: video Subscribe to: American IdiomsEnglish Slang Leave my opinion