zwaaien

Etymology
16th century. Predominantly considered an alteration of after certain words for swinging motions with initial zw-. Specifically perhaps a merger of with. Another theory derives it from rare, which is cognate with. Relation with, whence probably , is unlikely as it would require a highly irregular phonetic development in Dutch.

Verb

 * 1)  to sway, to wave
 * 2)  to brandish