Wiktionary
tent-pole
n. (alternative form of tentpole English)
Wikipedia
Tent-pole (entertainment)
In broadcast programming and motion pictures, a tent-pole or tentpole is a program or movie that supports the financial performance of a movie studio or television network. A tent-pole movie may be expected to support the sale of tie-in merchandise.
Usage examples of "tent-pole".
She kicked one in the groin almost en passant and tossed another so that his head smashed into the tent-pole.
Amy's in a sort of light wrap around skirt, which she suddenly flings over him, producing a momentary tent-pole effect.