n. 25B6; verb an attempt to plumb her psyche : EXPLORE, probe, delve into, search, examine, investigate, fathom, penetrate, understand.
25B6; adverb
(informal) it went plumb through the screen : RIGHT, exactly, precisely, directly, dead, straight; informal (slap) bang.
(N. Amer. informal) he's plumb crazy : UTTERLY, absolutely, completely, downright, totally, quite, thoroughly.
(archaic) the bell hangs plumb : VERTICALLY, perpendicularly, straight down.
25B6; adjective a plumb drop : VERTICAL, perpendicular, straight.
25A0; plumb the depths FIND, experience the extremes, reach the lowest point; reach rock bottom.