"I don't like that glass cleaner, but my mother ..... by it," Nancy said to Rosa

[Englishlearner]

"I don't like that glass cleaner, but my mother ..... by it," Nancy said to Rosa. (*) goes (*) brags (*) swears (*) vows

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This is a companion discussion topic for the original entry at https://english.best/questions/15901,i-dont-like-that-glass-cleaner-but-my-mother-___-by-it-nancy-said-to-rosa/

[Torsten]

The correct answer is ‘swears by it’ which means ‘she has great confidence in it or in its power’.