This lesson trains 6 C2 idioms on Nature. Idioms signal fluency when used naturally — forcing them into every sentence hurts your score. Practise in the runner first, then revisit every expression in the glossary. Review mode after completion shows how each idiom fits its context.
As dead as a dodo
Completely dead or finished.
The old technology had been replaced by newer models and was no longer used.
Rock hard
Extremely hard or firm.
The ground was frozen solid after the long cold spell.
Engulfed in flames
Completely surrounded or covered by fire.
The old warehouse caught fire and was quickly consumed.
Stone cold
Completely cold or without any warmth.
The coffee had been left on the table for hours.
As dry as a bone
Extremely dry.
The desert landscape had received no rain for months.
Bone dry
Completely dry.
After weeks without rain, the riverbed was completely empty.