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English definition of “dial up”

dial up

phrasal verb with dial     /daɪəl/ verb [I or T] (UK -ll-, US -l-)
[I or T] COMMUNICATIONS to call a telephone number : I dialled up the answering service and found two messages . Someone had found his office number on an internet phone directory and dialed him up.
[I or T] INTERNET, COMMUNICATIONS to connect to a network or to the internet using a dial-up modem : The broadband connection is always on, so there's no need to dial up any more.
(Definition of dial up from the Cambridge Business English Dictionary © Cambridge University Press)
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