unstop

v (-pp-) [Tn] remove a blockage from (a waste-pipe) 除去（污水管）的障碍: unstop a sink, toilet, drain, etc 疏通洗涤槽、 抽水马桶、 下水道等.

unsociable, unsocial, unsold, unsolicited, unsolved, unsophisticated, unsound, unsparing, unsparingly, unspeakable, unspeakably, unspoiled, unspoken, unspotted, unstable, unsteadily, unsteadiness, unsteady, unstinting, unstintingly, unstoppable, unstuck, unstudied, unsubstantiated, unsuccessful, unsuitable, unsung, unsure, unsuspecting, unswerving, unsympathetic, untainted, untalented, untangle, untapped, untenable, unthinkable, unthinking, unthinkingly, unthreatening,