obstruct
v.
1610s, a back-formation from obstruction or else from Latin obstructus, past participle of obstruere "to block, to stop up" (see obstruction). Related: Obstructed; obstructing.
〔李〕[ob-=against or in the way of 挡住；struct=to pile 堆积⇒“to pile in the way of 堆积以挡住…去路”→] v. block；close up 阻塞；堵塞
〔李〕[ob-;struct] v.堵塞； 遮住； 妨碍； 阻扰 ←stru,struct (L struere,structum)=to build 建设