/plʌm; plʌm/
n
1 piece of lead that is tied to a cord and used to find the depth of water or test whether a wall, etc is vertical 测深锤, 铅锤（悬挂于绳上的铅块, 用以测水深或墙等是否垂直）.
2 (idm 习语) out of `plumb not vertical 不垂直的.

adv
1 exactly 恰恰; 正
*plumb in the centre 在正中.
2 (US infml 口) quite; absolutely 十分; 完全; 绝对
*He's plumb crazy. 他真是疯了.

v
1 [Tn]
(a) test (sth) by using a plumb-line 用铅垂线测（某物）.
(b) (fig 比喻) (try to) understand(sth) thoroughly 探索, 探究（某事物）
*plumb the mysteries of the universe 探索宇宙的奥秘.
2 (idm 习语) plumb the depths of sth reach the lowest point of sth 到达某事物的最低点
*plumb the depths of despair 绝望已极
* a film that really plumbs the depths of bad taste 趣味低级得真正到了极点的一部影片.
3 (phr v) plumb sth in attach (eg a washing-machine) to water-pipes 将（如洗衣机）与水管接通
*We've plumbed in the dishwasher. 我们已给洗碟机接上水管了.