发病 (fā bìng): to fall ill

He suddenly fell ill while in a meeting, and his colleagues quickly called an ambulance.

The symptoms of this disease are not obvious in the early stages of onset, so it is easily overlooked.

Doctors remind us that if an elderly family member falls ill, don't move them casually; you should call the emergency number first.

Because he received timely treatment, this episode of illness did not leave him with any after-effects.

When wild animals fall ill, they often hide, which is their instinct to protect themselves.