straighten

Plain form
straighten

Third-person singular
straightens

Past tense
straightened

Past participle
straightened

Present participle
straightening

(transitive & intransitive) If you straighten a place up, you put everything in the right place.
- Synonyms: tidy and clean
Can you straighten up in here, and make your bed?
(transitive & intransitive) If you straighten something, you make it straighter, less curved or irregular.
He took a deep breath and straightened up before walking in.

After going through the mountains, the road straightened out.

She usually straightened her hair in the mornings.

Verb