Longman Dictionary of Contemporary English
trunk call
noun
EXAMPLES FROM CORPUS
▪ It is really the public video trunk call office.
Wiktionary
trunk call
n. (context dated chiefly British English) a long distance telephone call, especially one connected by the operator
WordNet
trunk call
n. a telephone call made outside the local calling area [syn: long-distance, long-distance call]
Usage examples of "trunk call".
Before leaving his apartment, he placed a trunk call to Howard in New York.
It means nobody will be able to get a trunk call through Lythe till you say the word.