chin up

Short definition from Wiktionary

Phrase

1. 1
   Be happy; cheer up.

Verb

1. 1
   To face a situation cheerfully or with confidence.

Noun

1. 1
   (US) An exercise done for strengthening the arms and back, in which one lifts one's own weight while hanging from a bar. It can be defined more restrictively on criteria like the arms starting at lock-out, or the chin requiring contact with the bottom of the bar, or touching the neck to the bar. Palms may be facing in any direction.