Definition of subscriber trunk dialling in English:

subscriber trunk dialling

Line breaks: sub|scriber trunk dial|ling

Entry from British & World English dictionary

noun

[mass noun] British
The automatic connection of trunk calls by dialling without the assistance of an operator.

Definition of subscriber trunk dialling in:

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Word of the day retroflex
Pronunciation: ˈrɛtrə(ʊ)flɛks
adjective
turned backwards