Also see: HEARING
HEAR: Variation 1:
Tap your ear twice. This is a good variation to use for the concept of "sound." This is a good variation to use for "heard."
HEAR / listen:
LISTEN: This is a very active form of the sign for listen. It is not passive. This version is good for such things as "listening."
Animated: LISTEN
EAVESDROP / "overhear" / "listening in on someone's conversation" / "eavesdropping":
Animated: EAVESDROP
Notes: