Liberal Dictionary English Dictionary
lock seam WORD ORIGIN noun a joint between two pieces of sheet metal, made by folding up the overlapping edges against each other, then folding them over in the same direction a number of times. Liberaldictionary.com
Origin of lock seam First recorded in 1955–60 Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019