When debating the likelihood of intelligent aliens, she argued that the Rare Earth hypothesis explains why we have not yet encountered any extraterrestrial civilizations.

Opportunities to study that dialect in person are rare as hen's teeth.

The engineer selected several rare earth magnets to secure the prototype's sensors.

Environmental concerns are rising as mining for rare earth minerals expands to meet global demand for electronics.

Authentic tickets to that sold-out concert are rare as rocking horse shit, so you'll have to pay through the nose.

Her ability to remain calm under pressure was rare as a four-leaf clover in the hectic newsroom.

For dinner, she prepared three Welsh rarebits topped with smoked paprika and chives.

At the seaside café, I ordered a Welsh rarebit and a mug of tea to warm up.

For brunch, she ordered a buck rarebit and couldn't stop smiling as the poached egg's yolk oozed into the melted cheese.

For dinner, she toasted slices of bread and made a rich rarebit with sharp cheddar and mustard.