He saw that she was trying to hide a smile behind her hand.

Why had she ever wanted to hide such a beautiful smile?

The old man could not fully hide his smile, though he tried.

James hid a smile as he realized she'd read his mind.

The engineer's hand was at his mouth as if to hide a smile.

I hid a little smile and looked at the ceiling.

The lift door closed just in time to hide his smile.

It seemed possible the mask even hid a small smile.

He rubbed a hand across his mouth to hide a smile.

He was trying, without terrific success, to hide a smile.