swear by
/swɛər baɪ/
Meaning
To have immense confidence in something or believe it is incredibly effective. It is commonly used when talking about products, habits, remedies, or routines that someone uses consistently because they always work.
Examples
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My grandmother swears by drinking hot lemon water every single morning.
My grandmother swears by drinking hot lemon water every single morning.
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I swear by this brand of running shoes; they never give me blisters.
I swear by this brand of running shoes; they never give me blisters.
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She swears by her planner to keep her daily schedule organized.
She swears by her planner to keep her daily schedule organized.
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If you have a sore throat, my dad swears by gargling with warm salt water.
If you have a sore throat, my dad swears by gargling with warm salt water.
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Most professional designers swear by this software for their creative projects.
Most professional designers swear by this software for their creative projects.
Common Mistakes
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✗ I swear in this product.
✓ I swear by this product.
The correct preposition to use with this idiom is 'by', not 'in' or 'on'.
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✗ He swears by to wake up early.
✓ He swears by waking up early.
'By' is a preposition, so it must be followed by a noun or a gerund (-ing form), not an infinitive.
Related Expressions
Practice
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My sister ___ this moisturizer for dry skin; she uses it every day.
💡 Expresses strong belief in its effectiveness.
Show answer
swears by
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If you want to learn a language, I ___ practicing for fifteen minutes daily.
💡 Use the base form of the phrasal verb.
Show answer
swear by