straighten

Short definition from Wiktionary

Verb

1. 1
   To cause to become straight.
2. 2
   To become straight.
3. 3
   To put in order; to sort; to tidy up.
4. 4
   To clarify a situation or concept to (an audience).
5. 5
   To bribe or corrupt.
6. 6
   To stand up, especially from a sitting position.
7. 7
   To make heterosexual.