He fell down while running.

She fell due to the slippery floor.

The loggers used multiple felling heads to cut down the trees.

She carefully sewed the fell stitches to secure the fabric.

The fell-fields in the valley are covered in wildflowers.

He is a skilled fell runner.

Fell runners are known for their endurance and agility in mountainous terrain.

I enjoy fell running in the mountains.

The temperature fell below freezing last night.

They fell together in love at first sight.