noun
NAK
noun
1
In computing and networking, a signal indicating that a message was not received correctly (short for "negative acknowledgement").
"The modem sent a NAK after detecting a checksum error."
How to Use NAK
Learner’s notesIn plain EnglishA technical signal meaning "that message didn't come through properly" — the opposite of an ACK.
When to use it
Technical/computing jargon, almost always written in capitals as NAK.
Easily confused with
Word Forms
naks plural
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The modem sent a _____ after detecting a checksum error.