1
general::
1. Exhaust one's options, capacity, or the like by producing or performing to the maximum, as in The weight lifter maxed out at 180 kilograms. [Slang; late 1900s] 2. Reach a point at which no more growth, improvement, or benefit is possible, as in The salary for this job maxes out at $90,000. [Slang; late 1900s] 3. Relax, take things easy, as in Let's go to the beach and max out. [Slang; late 1900s]
American Heritage Idioms
2
general::
Phrase(s): max out
to reach one’s maximum in something, such as weight in weight lifting or credit on a credit card. • Andy finally maxed out at 300 pounds. • Randy just knew when he had maxed out. Something in his body told him to stop.
McGrawhill's American Idioms And Phrasal Verbs