nid-nodding1
/ˈnɪdnɒdɪŋ/noun
The action of nid-nod; repeated nodding.
Origin
Late 19th century; earliest use found in Littell's Living Age. From nid-nod + -ing.
nid-nodding2
/ˈnɪdnɒdɪŋ/adjective
That nods repeatedly.
Origin
Early 19th century; earliest use found in Susan Ferrier (1782–1854), novelist. From nid-nod + -ing.