English version

extension lead

From Longman Dictionary of Contemporary Englishextension leadexˈtension ˌlead British English, extension cord American English noun [countable]  an additional piece of electric wire that you attach to another wire to make a very long one syn extension
Examples from the Corpus
extension leadI bought an extension lead for the aerial point.You ask for an extension lead.The socket of course was out of reach, but again the case provided an extension lead.A very short length of cable is supplied with the machine, and this proved annoying unless an extension lead was used.The pictures are gone off the walls-a kettle on a long extension lead is on the bare table behind.Connection to the electricity supply should be via a weatherproof cable connector to the extension lead.
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