Plumb

Plumb [ pluhm  ]
	[ noun, verb ]
	MEANING :
	1. (n.) lead hung on a string to establish the vertical line or to determine the depth of water 2. (adj.) exactly vertical or perpendicular 3. (intr. v.) to work as a plumber 4. (tr. v.) to make vertical 5. (tr. v.) to examine closely
	USAGE EXAMPLE 1 :
	He was an experienced fisherman and would plumb the depth of the lake where he intended to fish.