Antonyms of verb straighten

1 of 6 senses of straighten

Sense 1
straighten, unbend -- (straighten up or out; make straight)
       Antonym of bend (Sense 1)
      => bend, flex -- (form a curve; "The stick does not bend")

Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb straighten

6 senses of straighten

Sense 1
straighten, unbend -- (straighten up or out; make straight)
       => change posture -- (undergo a change in bodily posture)

Sense 2
straighten, straighten out -- (make straight)
       => change, alter, modify -- (cause to change; make different; cause a transformation; "The advent of the automobile may have altered the growth pattern of the city"; "The discussion has changed my thinking about the issue")

Sense 3
straighten -- (get up from a sitting or slouching position; "The students straightened when the teacher entered")
       => change posture -- (undergo a change in bodily posture)

Sense 4
tidy, tidy up, clean up, neaten, straighten, straighten out, square away -- (put (things or places) in order; "Tidy up your room!")
       => order -- (bring order to or into; "Order these files")

Sense 5
roll out, straighten -- (straighten by unrolling; "roll out the big map")
       => unwind, disentangle -- (separate the tangles of)

Sense 6
straighten -- (make straight or straighter; "Straighten this post"; "straighten hair")
       => arrange, set up -- (put into a proper or systematic order; "arrange the books on the shelves in chronological order")
          Phrasal Verb-> straighten out#2; straighten out#5