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The Britannica Dictionary heck 1 ENTRIES FOUND:

• heck (noun)

heck /ˈhɛk/ noun heck /ˈhɛk/ noun Britannica Dictionary definition of HECK [noncount] informal — used as a more polite form of hell

• Oh, heck, I forgot my keys.
• “Did you give her any money?” “Heck, no!”
• They were mad as heck.
• I decided to go just for the heck of it.
• It was one heck of a good fight.
• Where in (the) heck did I put my keys?
• My back hurts like heck.
• Let's get the heck out of here.
• What the heck was that?
• What the heck, let's try it.

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