upside-down

a.颠倒的，倒置的

uplift, upon, upper, upper case, upper-cut, uppermost, uppish, upraise, upright, upright piano (also upright), uprightness, uprising, uproar, uproarious, uproariously, uproot, upset, upshot, upside, upside down, upstage, upstairs, upstanding, upstart, upstream, upsurge, upswing, uptake, uptight, uptown, upturn, upturned, upward, upward (also upwards / -wEdz; -wLdz/), upward mobility, upward(s), upwards, upwards of, upwind, uranium,