straighten up+◼◼◼[UK: ˈstreɪt.n̩ ʌp] [US: ˈstreɪt.n̩ ʌp]
straighten one’s back+[UK: ˈstreɪt.n̩ wʌnz ˈbæk] [US: ˈstreɪt.n̩ wʌnz ˈbæk]
↑