Her professional smile slipped when she saw who was standing in the hall.

When the big man added, "and a room for the night," however, the smile slipped.

The smile slipped from her face at the darkness of this thought.

His smile slipped for a moment, then he regained control.

After a moment, the fierce smile slipped from her face.

The smile slipped several steps later, and he nearly sat down in the road himself.

Then, as she realized what he meant, the warm smile slipped away.

A smile on both their faces and her hand slipped in his.

The smile on the man's face slipped for a moment.

Her smile slipped a fraction as she got a good look at us.