give the nod
idiom; informal

- give someone approval

- give someone permission to begin something, or promise support

- indicate approval, recognition or selection

Merriam-Webster, Collins English Dictionary, Dictionary.com

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PHRASE ORIGIN

The verb nod appeared in late Middle English as nodden, meaning to move the head briefly. Its deeper origin is uncertain. It may be related to Middle High German notten, “to move about or shake”, but the connection is disputed.

The noun developed from the physical action. Because a small downward movement of the head could silently express agreement, recognition or permission, a nod soon acquired a figurative meaning.

Give the nod simply turns that silent signal into words: the person with authority indicates that somebody may proceed. The related get the nod can also mean being selected for a job, team or role. An Oxford dictionary of idioms associates both expressions with the old saying a nod is as good as a wink to a blind horse: once the message has been understood, no further signal is needed. 

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THE LITTLE MOVEMENT THAT TALKS

A listener may nod twenty times during a conversation without agreeing once.

Linguists call such movements backchannels: small signals showing that the message has been heard and the speaker may continue. “Mm-hm”, “right” and “I see” do the same job. They support the conversation without seizing control of it.

That distinction matters. An affirmative nod answers a question; a feedback nod merely says, “I’m following you.” Research into German Sign Language found that nods perform several jobs, including affirmation, feedback and turn management. Their speed, size and duration can change with their purpose.

In one dataset, researchers examined 648 nods. Earlier motion-capture research on Finnish Sign Language found that a single nod lasted an average of 1.3 seconds, while continuous nodding averaged 2.1 seconds. What looks like one simple gesture is actually a flexible piece of conversational machinery. 

This also explains a familiar misunderstanding. A speaker sees a listener nodding and assumes: “She agrees with me.” The listener may mean only: “I understand what you’re saying.” Understanding, agreement and approval are three separate things.

When somebody finally gives the nod, therefore, the nod is no longer conversational background. It has become the decision.

Helga & Paul Smith

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SYNONYMS

approve, authorise, consent, endorse, GIVE THE NOD, give the go-ahead, give the green light, give the okay, sanction

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SMUGGLE OWAD into a conversation today, say something like:

“Once the finance director GIVES THE NOD, we can place the order.”

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