the world > movement > motion in specific manner > alternating or reciprocating motion > oscillation > oscillate [verb (transitive)] > wag > lightly (2)
transitive. To move (something) in this way; reflexive = 1. Also figurative.
transitive and intransitive. Reduplicated form combining wiggle, v. and waggle, v. (cf. Low German wigel-wageln vb.), emphasizing the alternation…