"Empowering Advanced Learners of English in Business and Academia - TOEFL / ESL / EFL"
Video example (click "CC" to view the text as it is spoken)
Context : Education
Semantic: fast, quick, urgency
Usage of “against the clock”
He worked against the clock to finish as many questions as possible on the TOEFL exam.
Examples of idiom “against the clock” from Twitter