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1. Settle or make right
   "we need to straighten out our disagreements";
   - iron out, put right
    
2. Extricate from entanglement
   "Can you straighten out the cord?";
   - disentangle, unsnarl
    
3. Change for the better
   "The lazy student promised to straighten out";
   - reform, see the light
    
4. Make straight
   - straighten
    
5. Make free from confusion or ambiguity; make clear
   - clear, clear up, shed light on, crystallize, crystallise [Brit], crystalize, crystalise [Brit], sort out, enlighten, illuminate, elucidate
    
6. Put (things or places) in order
   - tidy, tidy up, clean up, neaten, straighten, square away [N. Amer], declutter

Derived forms: straightens out, straightening out, straightened out

Type of: alter, ameliorate, amend, better, change, clarify, clear up, elucidate, improve, meliorate, mend, modify, order

Antonym: mat