rise to the occasion

verb2

1. •
   To show resolve or effectiveness in dealing with a difficulty.

   • As it happened, this particular ordeal was exceedingly severe, but nothing can excuse the absolute failure of the troops concerned to rise to the occasion. — 1902
2. •
   (humorous, euphemistic) To achieve an erection of the penis.

   • To his comic fury and shame, the traveller's 'master part' fails to rise to the occasion, and the girl's innocence is preserved. — 2001