Simple past tense and past participle of turnpike.(verb)
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Use "turnpiked" in a sentence
"The road got fixed after a fashion, here and there -- a bridge mended, a ditch cleaned out, the loose stones removed, a hole filled up, or a short section "turnpiked" -- but the days were eight - hour days and they did not sit heavy upon us."
"Huron tract, was already cleared out, the full width of sixty-six feet, preparatory to its being turnpiked."