cross heart

cross my heart (and hope to die)

A vow that one is being truthful. Billy's the one who broke the cookie jar—cross my heart and hope to die! A: "Did you take that money?" B: "No, cross my heart!"
See also: cross, heart, hope, to
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

cross one's heart (and hope to die)

Fig. a phrase said to pledge or vow that the truth is being told. It's true, cross my heart and hope to die. It's really true—cross my heart.
See also: cross, heart
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
See also:
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