Usually means: Firmly believe in its effectiveness.
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We found 11 dictionaries that define the word swear by:

General (8 matching dictionaries)
  1. swear by: Longman Dictionary of Contemporary English
  2. swear by: Merriam-Webster
  3. swear by: Oxford Learner's Dictionaries
  4. swear by: Wiktionary
  5. swear by: Dictionary.com
  6. swear by: TheFreeDictionary.com

Business (2 matching dictionaries)
  1. swear by: Merriam-Webster Legal Dictionary
  2. swear by: Legal dictionary

Miscellaneous (1 matching dictionary)
  1. swear by: Idioms

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Definitions from Wiktionary (swear by)

▸ verb:  To invoke in an oath; to swear upon.
▸ verb:  (idiomatic) To trust wholeheartedly.

Similar:
swear upon, swear on, swear, beswear, swear in, take oath, swear to God, avow, promise, give one's word, more...

Opposite:
disavow, deny, repudiate, disclaim

Phrases:
to swear by, i swear to be by your side, more...

▸ Words similar to swear by

▸ Usage examples for swear by

▸ Idioms related to swear by

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▸ Words that often appear near swear by

▸ Rhymes of swear by

▸ Invented words related to swear by

Similar:
swear upon, swear on, swear, beswear, swear in, take oath, swear to God, avow, promise, give one's word, more...

Opposite:
disavow, deny, repudiate, disclaim

Phrases:
to swear by, i swear to be by your side, more...



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