Etymology
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can (v.2)
"to put up in cans," 1860, from can (n.1), especially "to put up in a sealed container for preservation." Sense of "to fire an employee" is from 1905. Related: Canned; canning.
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can (v.1)

Old English 1st & 3rd person singular present indicative of cunnan "to know," less commonly as an auxiliary, "to have power to, to be able," (also "to have carnal knowledge"), from Proto-Germanic *kunnjanan "to be mentally able, to have learned" (source also of Old Norse kenna "to become acquainted, try," Old Frisian kanna "to recognize, admit, know," German kennen "to know," Middle Dutch kennen "to know," Gothic kannjan "to make known"), from PIE root *gno- "to know."

It holds now only the third sense of "to know," that of "to know how to do something" (as opposed to "to know as a fact" and "to be acquainted with" something or someone). Also used in the sense of may, denoting mere permission. An Old English preterite-present verb, its original past participle, couth, survived only in negation (see uncouth), but compare could. The present participle has spun off with a deflected sense as cunning.

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can (n.)
generally, "a small cylindrical sheet-metal vessel used to contain liquids, preserves, etc.," Old English canne "a cup, container," from Proto-Germanic *kanna (source also of Old Saxon, Old Norse, Swedish kanna "a can, tankard, mug," also a unit of measure, Middle Dutch kanne, Dutch kan, Old High German channa, German Kanne). Probably an early borrowing from Late Latin canna "container, vessel," from Latin canna "reed," also "reed pipe, small boat;" but the sense evolution is difficult.

Modern sense of "air-tight vessel of tinned iron" is from 1867. Slang meaning "toilet" is c. 1900, said to be a shortening of piss-can; meaning "buttocks" is from c. 1910, perhaps extended from this.
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can-opener (n.)
"instrument for opening one end of a sealed tin can," 1868, from can (n.) + opener.
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oil-can (n.)

"can for holding oil," especially one with a long, narrow, tapering spout, used to oil machinery, 1839, from oil (n.) + can (n.).

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cannery (n.)
"establishment for preserving meats, fish, fruits, etc. in airtight cans," 1872, from can (v.2) + -ery.
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jerry-can (n.)
"5-gallon metal container," 1943, from Jerry "a German." It was first used by German troops in World War II and later adopted by the Allies.
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can-do (adj.)
"confident of performance," by 1952, from expression can do "it is possible" (1903), literally "(I or we) can do (it)," which is perhaps based on earlier no can do (see no).
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cannot (v.)
c. 1400, from can (v.1) + not. Old English expressed the notion by ne cunnan. The typical representation of the Scottish pronunciation is canna.
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ale-conner (n.)
late 13c. as a surname, from ale + conner, from Old English cunnere "examiner, inspector," agent noun from cunnan "to know, know how" (see can (v.1)).
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