swear by something phrasal verb informal (see also swear)
to have great confidence in how good or effective something is:
He swears by vitamin C pills.

[TahlilGaran] Dictionary of Contemporary English ▲

swear by
swear by (something)
to strongly believe in something.
Though there's no scientific evidence for this method of finding water, some farmers swear by it.

Some teachers swear by stickers as a teaching tool and use them to teach kids everything.

[TahlilGaran] English Idioms Dictionary ▲

swear by something
swear by (something)
to strongly believe in something.
Though there's no scientific evidence for this method of finding water, some farmers swear by it.

Some teachers swear by stickers as a teaching tool and use them to teach kids everything.

[TahlilGaran] English Idioms Dictionary ▲

swear by
to have complete confidence in something, to be sure of something
My father swears by the walk that he takes every morning.

[TahlilGaran] English Idioms Dictionary ▲

swear by something
to have complete confidence in something, to be sure of something
My father swears by the walk that he takes every morning.

[TahlilGaran] English Idioms Dictionary ▲

swear by
v.
1. To use as the support or authority that what you are saying is truthful; take an oath upon.
A witness swears by the Bible that he will tell the truth.
In ancient Greece a doctor swore by Apollo, the god of healing, that he would be a good doctor.
John swore by his honor he would return the bike.
2. To have complete confidence in; be sure of; trust completely.
When John has to go somewhere fast, he swears by his bike to get there.
We can be sure that Fred will come on time, since his friend Tom swears by him.

[TahlilGaran] English Idioms Dictionary ▲