swear byRate this phrase:(4.00 / 4 votes)Say it
To wholeheartedly trust.

I swear by my Petit Larousse when it comes to learning French.

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"swear by." Phrases.net. STANDS4 LLC, 2017. Web. 18 Dec. 2017. <http://www.phrases.net/phrase/swear-by_1494>.

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