Heck is defined as another, more polite way to say hell, an expression of surprise or anger.
(interjection)An example of heck is the saying, “What the heck?” instead of “What the hell?”
See heck in Webster's New World College Dictionary
interjection, noun
Origin: var. of Scot dial. hech, exclamation of surprise, sorrow, fatigue: Scot form of heigh
See heck in American Heritage Dictionary 4
interjection
Origin:
Origin: Alteration of hell
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