- to fasten with a lag screw.
- a heavy wood screw having a square or hexagonal head driven by a wrench.
Origin of lag screw
First recorded in 1870–75
Also called coach screw, lag bolt.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- a woodscrew with a square head
from lag ³; the screw was originally used to fasten barrel staves