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大仕事

major undertaking, big job

大 large; great; very (as an intensifier) + 仕事 work, job
noun Rare #42,327
major undertaking, big job Refers to a task that requires considerable effort; it need not be paid work.
JA: この部屋を一人で片づけるのは大仕事だ。
EN: Cleaning this room by myself is a major undertaking.

大仕事らしいですねで一体どういう？

Sounds like a big job. So what exactly is it?

— High and Low (1963)

そんな大仕事が私にできるかどうか心配だ。

I'm worried whether I can handle such a big task.

いや、これは大仕事になりそうだと思った。

No, I thought this was going to be a big job.