wave at

wave at someone

 and wave to someone
to move an upraised hand in such a way as to signal recognition to someone. The people in the boat waved at us. They waved to us after we waved at them.
See also: wave
References in periodicals archive ?
Basic geometry puts the wave at more than 34 m tall, the highest ever observed.
Here are the basics: When more than one surfer attempts to catch a wave at the same time, the one closest to the point where the wave first breaks will catch it first and have right of way.