box office
box office {n.}, {informal}
1. The place at movies and theaters where tickets may be purchased just before the performance instead of having ordered them through the telephone or having bought them at a ticket agency.
No need to reserve the seats; we can pick them up at the box office.
2. A best selling movie, musical, or drama (where the tickets are all always sold out and people line up in front of the box office).
John Wayne's last movie was a regular box office.
3. Anything successful or well liked.
Betsie is no longer box office with me.
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Source: A Dictionary of American Idioms