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English definition of “frank”

frank

verb [T]     /fræŋk/
to print a mark on stamps so that they cannot be used again, or to print a mark on envelopes or packages to show that the cost of sending them has been paid: Senators can also send franked mail. You can only acquire franking machines on a rental basis.
(Definition of frank verb from the Cambridge Business English Dictionary © Cambridge University Press)
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