Verb straighten has 6 senses
  1. straighten, unbend - straighten up or out; make straight
    --1 is one way to change posture
    Antonyms: bend, flex
    Sample sentences:
    Something ----s
    Somebody ----s something
  2. straighten, straighten out - make straight
    --2 is one way to change, alter, modify
    Derived form: noun straightener1
    Sample sentences:
    Something ----s
    Somebody ----s
    Somebody ----s something
    Something ----s something
  3. straighten - get up from a sitting or slouching position; "The students straightened when the teacher entered"
    --3 is one way to
    change posture
    Sample sentences:
    Something ----s
    Somebody ----s
  4. tidy, tidy up, clean up, neaten, straighten, straighten out, square away - put (things or places) in order; "Tidy up your room!"
    --4 is one way to order
    Sample sentence:
    Somebody ----s something
  5. roll out, straighten - straighten by unrolling; "roll out the big map"
    --5 is one way to unwind, disentangle
    Sample sentence:
    Somebody ----s something
  6. straighten - make straight or straighter; "Straighten this post"; "straighten hair"
    --6 is one way to
    arrange, set up
    Sample sentence:
    They straighten their hair
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