expression, godan verb (-ru)
get into an argument; come to discuss
Describes a situation where a topic becomes the subject of debate or argument, often implying a shift from a non-argumentative state.
会議でその提案が議論になった。
The proposal became a topic of discussion at the meeting.
些細なことから二人は議論になった。
A trivial matter led the two to get into an argument.
expression, godan verb (-ru)
be controversial; be contentious
Often used in the form 議論になっている to describe a topic that is currently under debate or disputed. Can function adjectivally.
その政策はまだ議論になっている。
That policy is still controversial.
この問題は長年議論になっている。
This issue has been contentious for many years.