"straightens" in the verb sense
1. straighten, unbend
straighten up or out make straight
2. straighten, straighten out
make straight
3. straighten
get up from a sitting or slouching position
"The students straightened when the teacher entered"
4. tidy, tidy up, clean up, neaten, straighten, straighten out, square away
put (things or places) in order
"Tidy up your room!"
5. roll out, straighten
straighten by unrolling
"roll out the big map"
6. straighten
make straight or straighter
"Straighten this post"
"straighten hair"
Source: WordNet® (An amazing lexical database of English)
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