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The Collaborative International Dictionary
Turnpiking

Turnpike \Turn"pike`\, v. t. [imp. & p. p. Turnpiked; p. pr. & vb. n. Turnpiking.] To form, as a road, in the manner of a turnpike road; into a rounded form, as the path of a road.
--Knowles.

Wiktionary
turnpiking

vb. (present participle of turnpike English)