max out

verb5

1. •
   (informal) To reach the limit of one's capabilities.

   • In the bench press, he has maxed out at 110 kg.
2. •
   (informal) To reach a maximum or a point at which no more growth or improvement is possible.

   • This machine maxes out at a 110 kW output.
3. •
   (informal) To use (something) to the limit of its capabilities.

   • I've spent all afternoon shopping and maxed out my credit card.
4. •
   (informal, slang) To reach the end of a complete sentence with no early parole, time off for good behavior, etc.
5. •
   (US, slang) To relax.