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Wiktionary
straighten out

vb. 1 (context transitive English) To make straight. 2 (context transitive idiomatic English) To correct or rectify. 3 (context transitive idiomatic English) To eliminate confusion from or concerning. 4 (context intransitive idiomatic English) To correct; to stop doing something wrong. 5 (cx transitive English) To tidy, neaten, or organize.

WordNet
straighten out
  1. v. settle or put right; "we need to iron out our disagreements" [syn: iron out, put right]

  2. extricate from entanglement; "Can you disentangle the cord?" [syn: disentangle, unsnarl] [ant: entangle, entangle]

  3. change for the better; "The lazy student promised to reform"; "the habitual cheater finally saw the light" [syn: reform, see the light]

  4. make straight [syn: straighten]

  5. make free from confusion or ambiguity; make clear; "Could you clarify these remarks?"; "Clear up the question of who is at fault" [syn: clear, clear up, shed light on, crystallize, crystallise, crystalize, crystalise, sort out, enlighten, illuminate, elucidate]

  6. put (things or places) in order; "Tidy up your room!" [syn: tidy, tidy up, clean up, neaten, straighten, square away]