[v] put (things or places) in order; "Tidy up your room!"
[v] make straight or straighter; "Straighten this post"; "straighten hair"
[v] make straight
[v] straighten by unrolling; "roll out the big map"
[v] get up from a sitting or slouching position; "The students straightened when the teacher entered"
[v] straighten up or out; make straight