Wiktionary
be taken ill
vb. (context idiomatic English) To become ill.
Usage examples of "be taken ill".
If the prince should be taken ill, for example, the page would go to the king and he would send for his physicians.
To think that, after a party which he gave for me, he should be taken ill, and not only that but be robbed at the same time!
But what if the womants best friend should then die accidentally, or be taken ill in the same way?
Lady Lysa would not permit the boy to enter the sickroom, for fear that he too might be taken ill.