Etymology
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hole (n.)

Old English hol (adj.) "hollow, concave;" as a noun, "hollow place; cave; orifice; perforation," from Proto-Germanic *hulan (source also of Old Saxon, Old Frisian, Old High German hol, Middle Dutch hool, Old Norse holr, German hohl "hollow," Gothic us-hulon "to hollow out"), from PIE root *kel- (1) "to cover, conceal, save." As an adjective, it has been displaced by hollow, which in Old English was only a noun, meaning "excavated habitation of certain wild animals."

As a contemptuous word for "small dingy lodging or abode" it is attested from 1610s. Meaning "a fix, scrape, mess" is from 1760. Obscene slang use for "vulva" is implied from mid-14c. Golfing hole-in-one is from 1914; as a verbal phrase from 1913. To need (something) like a hole in the head, applied to something useless or detrimental, first recorded 1944 in entertainment publications, probably a translation of a Yiddish expression such as ich darf es vi a loch in kop.

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hole (v.)
"to make a hole," Old English holian "to hollow out, scoop out," from source of hole (n.). Related: Holed; holing. To hole up "seek a temporary shelter or hiding place" is from 1875.
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hidy-hole (n.)
1817, altered from hiding-hole (1610s); from hiding (n.1) + hole (n.).
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peep-hole (n.)

"hole or crevice through which one may peep or look," 1680s, from peep (v.1) + hole (n.).

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air-hole (n.)

"an opening to admit or discharge air," 1766, from air (n.1) + hole (n.).

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hell-hole (n.)
also hellhole, late 14c., "the pit of Hell," from hell + hole (n.). Meaning "very unpleasant place" is from 1866.
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post-hole (n.)

"hole cut in the ground to receive the end of a fence-post," 1703, from post (n.1) + hole (n.).

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knot-hole (n.)
also knothole, "hole left in a plank or board after a knot has dropped out," 1726, see knot (n.) + hole (n.).
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blow-hole (n.)
also blowhole, nostril of a whale or porpoise, 1787, from blow (v.1) + hole.
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