v.
straighten up or out; make straight
同义词:unbend
make straight
同义词:straighten out
get up from a sitting or slouching position
"The students straightened when the teacher entered"
put (things or places) in order
同义词:tidytidy upclean upneatenstraighten outsquare away
straighten by unrolling
同义词:roll out
make straight or straighter
"straighten hair"