Green’s Dictionary of Slang

blind date n.

[SE colloq. date, an appointment made for sexual/social purposes]

[1920s+] (orig. US) an evening out with someone whom one has never met but who will be introduced by a mutual friend.

In phrases

drag a blind (v.) [drag v.1 (4)]

[1920s] (US campus) to spend an evening out with someone whom one has never previously met.