out of date

过时的，陈旧的

otherwise, otiose, otter, ottoman, OU, oubliette, ouch, ought, ought to, Ouija, ounce, our, ours, ourselves, oust, out, out of, out of breath, out of control, out of danger, out of debt, out of doors, out of favour, out of focus, out of order, out of place, out of power, out of practice, out of proportion, out of question, out of sight, out of step, out of the corner of one's eye, out of the question, out of touch, out of work, out-, out-and-out, out-of-phase, out-of-shape,