His grin disappeared the moment her back was turned.

The grin disappeared momentarily from the fat red face but then returned.

His grin disappeared as he reached the entrance to the tunnel.

The grin on Turner's face disappeared for a startled moment.

My grin disappeared the moment he opened the door, however.

His grin disappeared and he looked at her with renewed respect.

The broad grin disappeared like a fox down a hole.

She looked around in time to see a grin disappear from Quicksilver's face.

The man's grin had disappeared; his face was stern and cold.

He again leaned forward and the grin disappeared from his face.