# swear by

idiom

Source: https://englishreference.com/idiom/swear-by
Updated: 2026-08-10

## Meaning

To trust wholeheartedly.

## Examples

- I swear by this coffee brand.
- My sister swears by this natural remedy whenever she has a bad headache.
- Professional chefs often swear by the quality of copper pans, claiming they provide the precise heat control necessary for delicate sauces.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.