transitive. To reduce gradually and regularly in breadth or thickness in one direction; to make tapering.
transitive. To make thin; to reduce in thickness or depth; to spread or draw out in a thin layer or thread. to thin off, down: to diminish…
transitive. To cause or make to taper; spec. in Shipbuilding (see quot. 1846).
transitive. To cause to fall away gradually towards the end; to taper off.