spanner (spanners plural )
1 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)
in AM, usually use wrench, monkey wrench
2 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)
♦
throw a spanner in the works phrase
A bad result is sure to throw a spanner in the works.
in AM, use throw a wrench, throw a monkey wrench