Where does “at a pinch” come from?

at a pinch (English) comes from English pinch, from Middle English pinchen, from Old French pincer, from Vulgar Latin pincio, from Latin punctiō, from Latin -tiō, from Latin dissertātiō, from Latin dissertus — small stone, pebble; gravel, rubble.

Ancestry of “at a pinch”, step by step

at a pinch traces back through 3 separate lines of ancestry.

via English pinch

StepLanguageWordMeaning
1EnglishpinchTo squeeze a small amount of a person's skin and...
2Middle Englishpinchen
3Old Frenchpincerto pinch
4Vulgar Latinpincioto puncture, pinch; I puncture, prick, pierce,...
5Latinpunctiōpuncture, pricking
6Latin-tiōtion, -ation, -ing
7Latindissertātiō(spoken) dissertation, discourse, disquisition
8Latindissertusarranged, disposed; explained
9Latindissereresecond-person singular future passive indicative...
10Latindis-asunder, apart, in two; reversal, removal;...
11Latincalceusshoe
12Latincalxlimestone; chalk; the finish line
13Ancient Greekχάλιξsmall stone, pebble; gravel, rubble

via English A

StepLanguageWordMeaning
1EnglishAThe ordinal number first, derived from this...
2EnglishANDAlternative form of ∧, the conjunction operator;...
3Middle Englishandand, and then; however, yet, but, though. while;...
4Old Englishandand; even; also
5Proto-Germanicandiin addition, furthermore, and
6Proto-Indo-Europeanh₂éntiopposite; near; in front
7Proto-Indo-Europeanh₂éntsforehead; front
8Proto-Indo-Europeanh₂ent-face; forehead; front
9Proto-Indo-Europeanh₂en-on, onto

via English AT

StepLanguageWordMeaning
1EnglishATInitialism of assistive technology; Initialism of...
2Middle Englishatat; to
3Old Englishæteating; at a certain place; at a certain time
4Proto-Turkicātname
5Proto-Germanicētąthe act of eating; food
6Proto-Germanicetanąto eat
7Proto-Indo-Europeanh₁édtito eat
8Proto-Indo-Europeanh₁ed-to eat
Every word from Ancient Greek χάλιξEvery word from Latin -tiōEvery word from Latin dis-