chainsaw /ˈt͡ʃeɪnˌsɔː/verb 2noun 1forms 4 verb2 •To cut with a chainsaw.She and Barber once stopped a developer from chainsawing mature trees on Mississauga Rd. by standing in front of them. — 2009 •(figurative) To make quick and substantial spending cuts. noun1 •A power saw that has a power-driven and fast-revolving chain of metal teeth, usually used to cut trees.He used a chainsaw to cut through the fallen tree on the roadway. formschainsawed · chainsawn · chainsawing · chainsaws