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swear by

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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]

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Shoelaces, rainbow, toothpaste, and haircuts are all what type of noun?

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

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