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Spanner in the works

Posted by David FG on July 01, 2009 at 19:07

In Reply to: Spanner in the works posted by Giles Wynne on July 01, 2009 at 07:29:

: "Spanner in the works". Could this have been an expression used to slow down the production line on a car plant, which was going too fast?

I am certainly no engineer, but I would imagine that throwing something like a spanner into a machine would have rather more serious consequences than slowing it up.