1
general::
1. Fit into a category or classification, as in This document comes under the heading "classified." [Mid1600s] 2. Be the responsibility or province of, as in My department comes under your jurisdiction. [Early 1700s]
American Heritage Idioms
2
general::
Phrase(s): come under something
to be classed in the category of something. • This request comes under the category of a plain nuisance. • Your proposal comes under the heading of new business and is out of order.
McGrawhill's American Idioms And Phrasal Verbs