Dictionary.com

swear by

Save This Word!

1

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

2

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]

3

Take an oath by, as in I swear by all the saints in heaven. [Early 1200s]

QUIZ
QUIZ YOURSELF ON "IS" VS. "ARE"
"Is" it time for a new quiz? "Are" you ready? Then prove your excellent skills on using "is" vs. "are."
Question 1 of 7
IS and ARE are both forms of which verb?
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

How to use swear by in a sentence

FEEDBACK