nodsat Acknowledges silently Acknowledges, in a way Acknowledges tacitly Signals, in a way Greets wordlessly Acknowledges wordlessly, in a way Acknowledges wordlessly Acknowledges with a head tilt Signals, as to an auctioneer Acknowledges in passing Greets nonverbally Acknowledges nonverbally Gives a passing acknowledgment Acknowledges without a sound Greets, in a way Greets silently