spanners1) N-COUNT A spanner is a metal tool whose end fits round a nut so that you can turn it to loosen or tighten it. [mainly BRIT]Syn:AM, usually use , monkey wrench)2) PHRASE: V inflects If someone throws a spanner in the works, they prevent something happening smoothly in the way that it was planned, by causing a problem or difficulty. [BRIT](in AM, use throw a wrench, throw a monkey wrench)
A bad result is sure to throw a spanner in the works.
English dictionary. 2008.