Simple past tense and past participle of thunk.(verb)
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Use "thunked" in a sentence
"His sword thunked against Gerard's helm, setting his ears to ringing and scattering his wits."
"At the angle I had it, and moved it, and may have been generally rough, as I "thunked" it in the closet, the front of the scope was hitting the wall."
"The Hefty’s tag thunked into his chest, pinning the linen to his skin."