The argument boiled down to a simple misunderstanding.
boil down to
Frequency:
70
%
After hours of discussion, it all boiled down to one key point.
boil down to
Frequency:
50
%
The investigation will likely boil down to a few key suspects.
Idiomatic Expressions for boil down
Phrase: boil it down
Meaning: to simplify or reduce something to its most basic form
Usage: Let's boil it down to the key issues before making a decision.