Movements? Nods or shakes (6)

I believe the answer is:

rondos

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'movements?' is the definition.
The answer and definition can be both related to communication as well as being plural nouns.
Maybe you can see a link between them that I don't see?

'nods or shakes' is the wordplay.
'shakes' is an anagram indicator.
'nods'+'or'='nodsor'
'nodsor' is an anagram of 'RONDOS'.

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