spanner wrench

spanner

[span-er]
noun
1.
a person or thing that spans.
2.
Also called spanner wrench. a wrench having a curved head with a hook or pin at one end for engaging notches or holes in collars, certain kinds of nuts, etc. Compare pin wrench.
3.
Chiefly British. a wrench, especially one with fixed jaws.

Origin:
1630–40; span1 + -er1

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World English Dictionary
spanner (ˈspænə)
 
n
1.  a steel hand tool with a handle carrying jaws or a hole of particular shape designed to grip a nut or bolt head
2.  informal (Brit) a source of impediment or annoyance (esp in the phrase throw a spanner in the works)
 
[C17: from German, from spannen to stretch, span1]

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