We found one dictionary that defines the word closing curtains:

General (1 matching dictionary)

1. closing curtains: Vocabulary.com

(Note: See closing_curtain as well.)

Definitions from WordNet (closing curtain) ▸ noun:  the concluding part of any performance ▸ Also see closing_curtain ▸ Words similar to closing curtains ▸ Usage examples for closing curtains ▸ Idioms related to closing curtains ▸ Wikipedia articles (New!) ▸ Words that often appear near closing curtains ▸ Rhymes of closing curtains ▸ Invented words related to closing curtains