plumb

[1]	sound , fathom , measure , probe , explore , measure , gauge , delve , penetrate

[1]	plumb bob , weight , (plumb-)bob , plummet , plummet , lead , sinker

adv.

[1]	vertically , perpendicularly , straight up and down
[2]	exactly , precisely , dead , right , accurately , (Colloq) slap , (Brit) bang , spot
[3]	clean , plum
[4]	plum

adj.

[1]	vertical , perpendicular , straight up and down