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stand by

Phrasal Verb with stand
 
 
/stænd/ verb (past tense and past participle stood)

Definition

BE READY to be ready to do something or to help: Doctors were standing by to treat the injured passengers.
DO NOTHING to do nothing to prevent something unpleasant from happening: We can't stand by while millions of people starve.
(Definition of stand by from the Cambridge Learner's Dictionary © Cambridge University Press)

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