His dropping in surprised everyone at the dinner party.

She's dropping in on her neighbor to return a book.

She added three dropfuls of the herbal tincture to the cup.

She collected a dropful of morning dew from the blade of grass.

There were a number of droppings in at the gallery yesterday, all looking for ticket refunds.

When the storm isolates the village, the relief plane air-drops food and medicine to the residents.

Rescue teams coordinated multiple air-drops to deliver food and medical supplies to the stranded villagers.

I always keep a bottle of eye drops in my bag during allergy season.

Every morning she drops off the donations at the community center.

After the tutor explained it again, the penny drops and he quickly solved the problem.