Have great reliance on or confidence in, as in She swears by her personal physician. [Early 1800s]
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]
Words nearby swear by
How to use swear by in a sentence
Nine new Republican senators will swear their oaths of office.The Democrats’ Black Hole—and What They Can Do About It|Michael Tomasky|December 31, 2014|DAILY BEAST
A step-by-step plan to break from your various technology addictions.
Those snakes attacked unwitting passers-by, or invaded homes and hotels.The Buddhist Business of Poaching Animals for Good Karma|Brendon Hong|December 28, 2014|DAILY BEAST
Or should you swear it off in the name of better cholesterol?Bulletproof Coffee and the Case for Butter as a Health Food|DailyBurn|December 27, 2014|DAILY BEAST
Horniness packs side-by-side by with a deeper loneliness along the walls of The Park.The Craziest Date Night for Single Jews, Where Mistletoe Is Ditched for Shots|Emily Shire|December 26, 2014|DAILY BEAST
All along the highways and by-paths of our literature we encounter much that pertains to this "queen of plants."
John was baptizing at a large pool called Ænon-by-Saleim,—probably allegorical, meaning “Fountain of Repose.”Solomon and Solomonic Literature|Moncure Daniel Conway
The sewing-machine made a resounding clatter in the room; it was of a ponderous, by-gone make.The Awakening and Selected Short Stories|Kate Chopin
Mr. Spurrell came down to see a horse, and we shall be very glad to have the benefit of his opinion by-and-by.
Three hours ago you had never seen me, and now you swear my indifference will kill you.