The difference between Drop someone a line and Ring up
When used as verbs, drop someone a line means write and send (someone) a note or telegram, whereas ring up means to telephone, to call someone on the telephone.
check bellow for the other definitions of Drop someone a line and Ring up
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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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Ring up as a verb (transitive, idiomatic):
To telephone, to call someone on the telephone.
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Ring up as a verb (transitive):
To enter (a payment) into a cash register, or till in a shop, or record a credit- or debit-card payment.
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Ring up as a verb (transitive):
To record the payment of.
Examples:
"The cashier took a long time to ring him up."
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Ring up as a verb (transitive):
To make an adverse official decision concerning (a person).
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Ring up as a verb:
To rouse by the ringing of a bell.
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Ring up as a verb (baseball, dated):
To strikeout a batter and thereby send him or her back to the dugout.