old hat

adjective

1. old-fashioned; dated.

2. trite from having long been used or known.

old hat

adjective

1. (postpositive) old-fashioned or trite

old hat

1. Obsolete, old-fashioned: “Get with it, Murray; your methods are strictly old hat.”

Word History and Origins

Origin of old hat¹

First recorded in 1745–55