laboring oar
Noun
Meaning
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.
Source: en.wiktionary.orgNoun
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.
Source: en.wiktionary.org