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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