become ill BrE
fall ill BrE
get sick AmE *
be taken ill
be taken sick
fall sick

He fell seriously ill and died on November 10, 1805.

But then, late in the fifth month, he suddenly fell very ill and died.

In 1827 he fell seriously ill and left the army on this ground.

Who and how many, they wondered, would fall ill or die this day?

There he fell suddenly ill and died on 15-th October.

At the end of 1882 he fell seriously ill and spent the last few years in a psychiatric hospital.

In 1189, Roger fell seriously ill and made his will.

In January 870, his father fell seriously ill and left him the government.

What happens if a child suddenly falls ill and has to be seen immediately?

She would also probably know better how to prevent falling ill herself.