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swear by

swear by

 
See:
swear
part of speech: phrase
definition 1: to name (someone or something) as one's witness or guarantee as to the truth of a declaration or the solemnity of a promise.
She swore by all the saints that she wouldn't divulge the secret.
definition 2: (informal) to be certain of; have confidence in.
You can swear by his loyalty to the company.
similar words:
bank on, believe, believe in, count on, set store by, trust