spanner
noun 
ˈspænə(r) 
ˈspænər (British English) (also wrench North American English, British English)
a metal tool with a specially shaped end for holding and turning nuts and bolts (= small metal rings and pins that hold things together)
I'll need a spanner to change the back wheel. compare adjustable spannerIdioms
(throw) a spanner in the works
(British English) (North American English (throw) a (monkey) wrench in the works) (to cause) a delay or problem with something that somebody is planning or doing
