straighten up

Từ điển WordNet v3.1 - WordNet Dictionary

verb

straighten oneself (Freq. 4)
- He drew himself up when he talked to his superior
• Syn:
draw up, pull up
• Derivationally related forms:
pull-up (for: pull up)
• Hypernyms:
straighten
• Verb Frames:
- Somebody ----s somebody