(concavity) 252.
hollow, pit, shaft, well, crater; gulf &c 198; bowels of the
earth, botttomless pit†, hell.
soundings, depth of water, water, draught, submersion; plummet,
sound, probe; sounding rod, sounding line; lead.
bathymetry.
[instrument to measure depth] sonar, side-looking sonar;
bathometer†.
V. be deep &c adj.; render deep &c adj.; deepen.
plunge &c 310; sound, fathom, plumb, cast the lead, heave the
lead, take soundings, make soundings; dig &c (excavate) 252.
Adj. deep, deep seated; profound, sunk, buried; submerged &c 310;
subaqueous, submarine, subterranean, subterraneous, subterrene†;
underground.
bottomless, soundless, fathomless; unfathomed, unfathomable;
abysmal; deep as a well; bathycolpian†; benthal†, benthopelagic†;
downreaching†, yawning.
knee deep, ankle deep.
Adv. beyond one's depth, out of one's depth; over head and ears; mark
twine, mark twain.