idiom

Silvia says she hides behind a smile – an idiom meaning to hide pain by presenting a happy outward appearance.

The idiom an angel on one shoulder and a devil on the other describes a personal dilemma where someone must choose whether to follow their conscience or not.

She says there was an angel on one shoulder and a devil on the other, an old idiom which describes having a personal dilemma.

Models are complex, but they're necessary because unfortunately no climate change at all is not on the table, and that's an idiom, meaning it's not an option.