Frank, outspoken, or energetically arguing—used as a four-character idiom to describe candid and often vigorous debate or expression of opinion.
会議では侃々諤々の議論が交わされ、結論を出すのに時間がかかった。
Vigorous debates were exchanged at the meeting, and it took time to reach a conclusion.
彼は会うたびに侃々諤々と政治の問題について語る。
Every time we meet he speaks candidly and vehemently about political issues.
討論会で侃々諤々と言い合う様子は聴衆の関心を引いた。
The audience was drawn to the heated back-and-forth at the debate.