crescent spanner
nounEtymology A genericization of the trade name of a company famous for making them (although it did not invent them); details are at Wikipedia. The trademark is still protected, and this genericized term is only informal and loose. Compare kleenex and coke.
1
Australia, New Zealand, Broadly, Idiomatic, Informal An open-end adjustable spanner with a worm-drive thumbwheel. When the term adjustable spanner or adjustable wrench is used, this type (branded with any of many brands) is usually the type meant.
2
Informal Used other than figuratively or idiomatically: any spanner made by the namesake company, which makes many tools.