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smart (v.)

Old English smeortan "be painful," from Proto-Germanic *smarta- (source also of Middle Dutch smerten, Dutch smarten, Old High German smerzan, German schmerzen "to pain," originally "to bite"), from PIE *smerd- "pain," which is perhaps an extension of the root *mer- "to rub away; to harm." Related: Smarted; smarting.

smart (adj.)

late Old English smeart "painful, severe, stinging; causing a sharp pain," related to smeortan (see smart (v.)). Meaning "executed with force and vigor" is from c. 1300. Meaning "quick, active, clever" is attested from c. 1300, from the notion of "cutting" wit, words, etc., or else "keen in bargaining." Meaning "trim in attire" first attested 1718, "ascending from the kitchen to the drawing-room c. 1880" [Weekley]. For sense evolution, compare sharp (adj.).

In reference to devices, the sense of "behaving as though guided by intelligence" (as in smart bomb) first attested 1972. Smarts "good sense, intelligence," is first recorded 1968 (Middle English had ingeny "intellectual capacity, cleverness" (early 15c.)). Smart cookie is from 1948.

smart (n.)

"sharp pain," c. 1200, from smart (adj.). Cognate with Middle Dutch smerte, Dutch smart, Old High German smerzo, German Schmerz "pain."

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Definitions of smart from WordNet
1
smart (adj.)
showing mental alertness and calculation and resourcefulness;
smart (adj.)
elegant and stylish;
a smart new dress
Synonyms: chic / voguish
smart (adj.)
characterized by quickness and ease in learning;
smart children talk earlier than the average
Synonyms: bright
smart (adj.)
improperly forward or bold;
Synonyms: fresh / impertinent / impudent / overbold / saucy / sassy / wise
smart (adj.)
painfully severe;
he gave the dog a smart blow
smart (adj.)
quick and brisk;
we walked at a smart pace
I gave him a smart salute
smart (adj.)
capable of independent and apparently intelligent action;
smart weapons
2
smart (v.)
be the source of pain;
Synonyms: ache / hurt
3
smart (n.)
a kind of pain such as that caused by a wound or a burn or a sore;
Synonyms: smarting / smartness
From wordnet.princeton.edu