Hi! I'm having trouble with following expression from Stanley Middleton novel Holiday. What does mean to be pretty in a straight-backed way? Is this some kind of an idiom? 'She was pretty in a straight-backed way, with wide eyes open at him, and possessed of a diffident intelligence; he bullied her, and she allowed it, though now and then she opposed his argument, sometimes beat him. She read widely, could contradict his facts, but still preferred a secondary, submissive role, and that pleased him.' thanks in advance Bartek.