Definition of stick by phrasal verb from the Oxford Advanced American Dictionary

 

stick by

 phrasal verb
phrasal verb
 
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Phrasal Verbs

stick by somebody

[no passive]
 
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to be loyal to a person and support them, especially in a difficult situation Her husband was charged with fraud but she stuck by him.

stick by something

[no passive]
 
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to do what you promised or planned to do They stuck by their decision.
See the Oxford Advanced Learner's Dictionary entry: stick by