With the project in its final stage, the team is working flat out.
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From Lu You's Song-dynasty poem 《村居》: 生僧快马随鞭影 — describing a horse so fast it already anticipates the whip. The image captures redoubled, urgent effort.
usage
Nearly always used figuratively for accelerating work or a project. Common collocations: 快马加鞭地 + verb, 快马加鞭,全力以赴.