Synonyms for Straighten (same or very similar meaning)
WordNet sense 1 (straighten up or out; make straight):
unbendWordNet sense 2 (straighten by unrolling):
roll outWordNet sense 3 (make straight):
straighten outWordNet sense 4 (put (things or places) in order):
neaten, tidy, clean up, square away, tidy upFrom the ODE community, based on WordNetadd/edit