Merle tried to smile, but the smile curdled, as though he were going to burst into tears.

Oba's smile curdled.

She swung about to face him, and her smile would have curdled the milk of a unicorn.

His smile curdled.

Her smile curdled: it was polite that year for the underprivileged to be polite back.

His brother's smile curdled like sour milk.

Alisande's smile curdled.

Publius' smile curdled.

Jaime's smile curdled.