English Dictionary

laboring oar

noun

An oar that is worked with great effort. / (chiefly US, figuratively, by extension) The part of a task that requires the greatest effort to achieve.

He took on the laboring oar and worked tirelessly to complete the project.

意味（1）

An oar that is worked with great effort.

意味（2）

(chiefly US, figuratively, by extension) The part of a task that requires the greatest effort to achieve.

And so too, when new issues demanding new policy calls come up within that scheme, Congress presumably wants the same agency, rather than any court, to take the laboring oar.