• Webster's Revised Unabridged Dictionary
    • n Dogbolt (Gun) The bolt of the cap-square over the trunnion of a cannon.
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Century Dictionary and Cyclopedia
    • n dogbolt A fool; a butt: a term of contempt.
    • n dogbolt The bolt which is used in connection with a dog, for holding a bonnet or a manhole or hand-hole cover in place.
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In literature:

Thou wilt never be such a dogbolt as to refuse a hint to a friend?
"Peveril of the Peak" by Sir Walter Scott