The difference between Drop someone a line and Telephone
When used as verbs, drop someone a line means write and send (someone) a note or telegram, whereas telephone means to (attempt to) contact someone using the telephone.
Telephone is also noun with the meaning: a telecommunication device (originally mechanical, and now electronic) used for two-way talking with another person (often shortened to phone).
check bellow for the other definitions of Drop someone a line and Telephone
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Drop someone a line as a verb (idiomatic):
Write and send (someone) a note or telegram.
Examples:
"If you get a chance, drop me a line when you arrive in Cairo."
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Telephone as a noun:
A telecommunication device (originally mechanical, and now electronic) used for two-way talking with another person (often shortened to phone).
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Telephone as a noun (North America, uncountable):
The game of Chinese whispers.
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Telephone as a verb (ambitransitive):
To (attempt to) contact someone using the telephone.