Meaning of "I'll make due"

When someone says "I'll make due" what does it mean?

Solution 1:

The idiom is actually “to make do”, and it means to work with what you have, to continue somehow despite an impediment or non-ideal circumstance.

It uses do in the sense of “suffice”, as in “That’ll do”.

Solution 2:

A further note regarding the usage of make due (an eggcorn in the question's original wording) and the intended expression make do...

A Google Ngram shows that of the two expressions, make do is currently about 15 times more common than make due, but was rarely used until about 1930. I think it's not too far of a stretch to suggest that the Great Depression may have had something to do with its increased popularity.

Usage of make do seems to have plateaued in the late '30s as economies started to recover, but it surged again from about 1940 (coinciding with World War II), and continued to gain in popularity right up to the 1980s (perhaps coinciding with thrift going out of fashion?). It's yet to be seen whether the recent "re-issuing" of the term following the Global Financial Crisis (see this answer) will transform the plateau from the 1980s into a renewed surge of popularity...