verb (used without object), swore or (Archaic) sware; sworn; swear·ing.
verb (used with object), swore or (Archaic) sware; sworn; swear·ing.
- to name (a sacred being or thing) as one's witness or guarantee in swearing.
- Informal. to have great confidence in; rely on: He swears by his dentist.
- to have certain knowledge of: I thought I saw him leaving, but I couldn't swear by it.
Words nearby swear
Origin of swear
OTHER WORDS FROM swearswear·er, nounswear·ing·ly, adverbre·swear, verb, re·swore, re·sworn, re·swear·ing.un·der·swear·er, noun
synonym study for swear
British Dictionary definitions for swear by
verb swears, swearing, swore or sworn
- to invoke (a deity, etc) by name as a witness or guarantee to an oath
- to trust implicitly; have complete confidence (in)
Derived forms of swearswearer, noun
Word Origin for swear
Idioms and Phrases with swear by
Have great reliance on or confidence in, as in She swears by her personal physician. [Early 1800s]
Also, swear to. Have reliable knowledge of, be sure of, as in I think she was going to the library but I can't swear to it. [Mid-1700s]
Take an oath by, as in I swear by all the saints in heaven. [Early 1200s]