Synonyms of 'swear by something'
▷ See swear
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I know I can rely on you to sort it out.
be confident of
be sure of
have confidence in
repose trust in
If you trust someone, you believe that they are honest and sincere and will not deliberately do anything to harm you.
‘I trust you completely,’ he said.
have faith in
take at face value
take as gospel
place reliance on
place your trust in
pin your faith on
place or have confidence in
Thesaurus for swear by something from the Collins English Thesaurus