Brit.
■ noun trademark a type of public address system.
■ verb transmit or announce over such a system.
Origin
1920s: contr. of tantalum alloy , which is used as a rectifier in the system.
TANNOY
Meaning of TANNOY in English
Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004