final push; last big effort
Wasei-eigo (Japanese-made English) term for a concentrated final effort or spurt before the end of a task, project, or event. Often used in sports, work, or study contexts.
wasei-eigo (Japanese-coined English), from last heavy
I pulled an all-nighter in a final push before the exam.
If we get through the final heavy push on the project, all that's left is the presentation.