max /mæks/adverb 1noun 3verb 2adjective 1forms 3phrases 2 adverb1 •(informal) at the mostFour days max, then, to get them to safety. — 1962 noun3 •(informal) An extreme, a great extent.He pushed himself to the max. •(informal) Clipping of maximum. •(slang, no longer used) Gin.Oh! for a glass of max! — 1819 verb2 •To reach the limit; to reach the maximum.He maxed out his odds of dating Rebecca.She maxed out all her credit cards while she was out of work. •(informal) To relax. adjective1 •(informal) Maximum; maximal. formsmaxed · maxing · maxes Phrases with max max outTo reach the limit of one's capabilities. to the maxTo a great degree or extent; very.