Usually means: Become sick or unwell suddenly.
Definitions Related words Mentions
We found 3 dictionaries that define the word fall ill:

General (1 matching dictionary)
  1. fall ill: Wiktionary

Business (1 matching dictionary)
  1. fall ill: Legal dictionary

Miscellaneous (1 matching dictionary)
  1. fall ill: Idioms

Definitions from Wiktionary (fall ill)

verb:  To become ill, to get sick, to sicken.

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