straighten
straighten
verb (straightens, straightened, straightened, straightening)
/ˈstreɪtn/
1 ​transitive, intransitive to become straight; to make something straight
straighten something (out) I straightened my tie and walked in.
She walked around my room, straightening things that didn’t need to be straightened.
straighten (out) The road bends here then straightens out.
2 ​transitive, intransitive to make your body straight without bending any part of it
straighten something He stood up and straightened his shoulders.
straighten something/yourself up I straightened myself up to answer the question.
straighten (up) Straighten up slowly, then repeat the exercise ten times.
Phrasal Verbs
straighten out
straighten up