In Unani medicine, Sara' refers to epilepsy, a neurological disorder marked by sudden seizures.
The literal meaning of Sara' is ‘to fall’, describing the classic symptom of an epileptic seizure where the patient suddenly loses consciousness and falls down.
Although frothing, muscle contractions, and tongue biting are symptoms that may occur during an epileptic attack, the term specifically means ‘to fall’.
Hence, the correct answer is To fall.