What is the X in X-mas?
"to push slightly with the elbow," 1670s, perhaps from Scandinavian (cf. Norwegian nugge, nyggje "to jostle, rub;" Icelandic nugga "to rub, massage"). Related: Nudged; nudging.
"complainer, nagger," 1960s, from Yiddish, from Slavic words meaning "fret, ache," realted to the root of nudnik (q.v.).
"a slight push," 1836, from nudge (v.).
That is easy