unbuckle

v [Tn] loosen or undo the buckle(s) of (a belt, etc) 松开或解开（带子等）的搭扣.

unbecoming, unbelief, unbelievable, unbelievably, unbeliever, unbelieving, unbend, unbending, unbiased, unbidden, unbind, unblemished, unblushing, unblushingly, unborn, unbounded, unbowed, unbreakable, unbridled, unbroken, unburden, unbusinesslike, unbutton, unbuttoned, uncalled-for, uncannily, uncanny, uncared-for, unceasing, unceasingly, unceremonious, unceremoniously, uncertain, uncertainly, uncertainty, unchallenged, unchangeable, unchanging, uncharacteristic, uncharitable,