mellow out

1. Become genial or pleasant, calm down, relax, as in The teacher mellowed out when they explained what had happened. This expression uses mellow in the sense of “ripening,” with the connotation of softness and sweetness. [Slang; late 1900s]

Related Words

• acquiesce 
• capitulate 
• cave in 
• come around 
• comply 
• ease off 
• give in 
• give up 
• let go 
• quit 
• relax 
• slacken 
• soften 
• subside