Definition of “go down with sth” - Learner’s Dictionary

go down with sth

UK informal phrasal verb with go us uk /ɡəʊ/ verb [ I ] present participle going, past tense went, past participle gone

B2 to become sick, usually with an illness that is not very serious:

Our whole class went down with the flu.

(Definition of “go down with sth” from the Cambridge Learner's Dictionary © Cambridge University Press)