could
/kəd/ verb, noun
Also a form of can
Forms coulds coulde couldst couldest could'st coud cou'd
- verb Used as a past subjunctive (contrary to fact). “I'd have thought you could have done the dishes, at least.”
- verb Used to politely ask for permission to do something. “Could I borrow your coat?”
- verb Used to politely ask for someone else to do something. “Could you proofread this email?”
- verb Used to show the possibility that something might happen. “We could rearrange the time if you like.”
- verb Used to suggest something. “You could try adding more salt to the soup.”
- noun Something that could happen, or could be the case, under different circumstances; a potentiality.
Etymology
From Middle English coude, couthe, cuthe, from Old English cūþe, past indicative and past subjunctive form of cunnan (“to be able”) (compare related cūþ, whence English couth). Cognate with German konnte, Swedish kunde.
The -l- in the spelling was added in the early 16th century by analogy with should and would; this analogy formerly affected the pronunciation as well and was probably assisted by the tendency for /l/ to be lost in those words (and so not written, leading to shudd, wode, etc).
Webster’s 1913
- verb Was, should be, or would be, able, capable, or susceptible.
Etymology [OF. coude. The l was inserted by mistake, under the influence of should and would.]
Sources: Wiktionary · Webster’s 1913 — from the Wiktionary entry “could”, CC BY-SA 4.0. Details