Catch a bug
Meaning
To become ill with a mild, often viral, infection.
Origin
The term "bug" has a long history referring to insects, often small and bothersome. As scientific understanding of microscopic organisms responsible for illness grew in the late 19th and early 20th centuries, the colloquial term "bug" was informally adopted. It cleverly likened these unseen, illness-causing pathogens to tiny, irritating insects that had invaded the body. This casual yet evocative usage quickly cemented itself in everyday language, becoming a popular and succinct way to describe contracting a common ailment, particularly in American English, transforming the image of a pesky insect into a shorthand for a temporary illness.
Examples
- I think I'm starting to catch a bug; I've been sneezing all morning.
- Many students caught a bug after the flu season started, leading to several absences.