stand-up
1. adjective
1
loyal to the end, devoted and dependable. Perhaps from boxing, where a stand-up fight was one in which the fighters stood up to each without flinching or evasion. The ultimate praise in the world of organised crime US, 1971.
2
solid; pure US, 1973
2. adverb
describing someone's play in pool, at your true skill level, not below it US, 1993