down with a disease
down with (an illness)
Sick with a particular illness, which is named after "with." I've been down with the flu all week and have barely gotten out of bed.
See also: down
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
*down with a disease
ill; sick at home. (Can be said about many diseases. *Typically: be ~; Come ~; get~.) Tom isn't here. He's down with a cold. Sally is down with the flu.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.