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View synonyms for swear by
swear by
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]
Have great reliance on or confidence in, as in She swears by her personal physician . [Early 1800s]
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