smash hit - Phrases/Idioms
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
An outstanding success, as in She was a smash hit in the role of the governess, or His first book was a smash hit but this one isn't doing well. [c. 1920]