spanner


Concise Oxford English Dictionary © 2008 Oxford University Press:
spanner/ˈspanə(r)/
noun chiefly Brit. a tool with a shaped opening or jaws for gripping and turning a nut or bolt.
– phrases
a spanner (or N. Amer. monkey wrench) in the works a person or thing that prevents the successful implementation of a plan.
– origin C18: from Ger. spannen ‘draw tight’ + -er1.
'spanner' also found in these Oxford entries:

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