ouch

interj (expressing sudden pain 表示突然疼痛): Ouch! That hurts! 哎哟! 疼!

osteopath, osteopathy, ostler, ostracism, ostracize, ostracize, ostracise, ostrich, OT, other, other from, other than, other-directed, other-worldly, others, otherwise, otiose, otter, ottoman, OU, oubliette, ought, ought to, Ouija, ounce, our, ours, ourselves, oust, out, out of, out of breath, out of control, out of danger, out of date, out of debt, out of doors, out of favour, out of focus, out of order, out of place,