Quote:
sound(4)
v. sound·ed, sound·ing, sounds
v. tr.
1. To measure the depth of (water), especially by means of a weighted line; fathom.
2. To try to learn the attitudes or opinions of: sounded out her feelings.
3. To probe (a body cavity) with a sound.
v. intr.
1. To measure depth.
2. To dive swiftly downward. Used of a whale or fish.
3. To look into a possibility; investigate.
n.
An instrument used to examine or explore body cavities, as for foreign bodies or other abnormalities, or to dilate strictures in them.
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Apparently, for once, it is the appropriate medical terminology.
Unlike "felching".