Where does “cos” come from?

Cos is a shortening of English because, which derives from Middle English bi cause, combining Middle English bi (from Old English bī, from Latin causa meaning reason or cause) with cause.

cos (English): A variety of lettuce with long, crisp leaves;...

Definitions

  1. A variety of lettuce with long, crisp leaves;...

Ancestry of “cos”, step by step

StepLanguageWordMeaning
1English'causeAphetic form of because
2EnglishbecauseBy or for the cause that; on this account that; for the reason that
3Middle Englishbi cause
4Middle Englishbiby
5Old Englishlullaby!; near, by; by, near, around
6Proto-West Germanicby, at; near, around
7Proto-Germanicbiby, at; near, around
8Proto-Indo-Europeanh₂m̥bʰiaround, on either side of, about; in exchange...
9Proto-Indo-Europeanh₂n̥tbʰi
10Proto-Indo-Europeanh₂éntsforehead; front
11Proto-Indo-Europeanh₂ent-face; forehead; front
12Proto-Indo-Europeanh₂en-on, onto
Every word from Proto-Indo-European h₂en-