put (one's) hand on (one's) heart

put (one's) hand on (one's) heart

To swear that something is completely truthful, genuine, or sincere. I can put my hand on my heart and say that we have only ever acted in the best interests of our customers.
See also: hand, heart, on, put
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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