straighten / straiten [ˈstreitən]
straighten – v. – 1. remove the bends from something that is crooked; 2. unravel, disentangle, set things right; 3. put in order; 4. stand erect
straiten – v. – 1. render narrow, contract; 2. close ranks of an army; 3. become more strict or rigorous; 4. confine in a narrow space