Usage examples (35)

• The chemist's sign, a large comic head with its mouth wide open (known as the gaper), is also subversive of confidence.
• The Elysium seas feature a large scavenger called a gaper, whose hinged jaw is easily capable of taking up a person in a single swallow.
• The idea is that your own mouth is so gape jawed at the sheer lack of skill a fisherman/skier is showing that they become the "gaper".
• A gaper was not long in coming; one swallow and Susan was in.