The discussion got a little heavy.

讨论变得有点严肃。

《牛津词典》

Some of these conversations can be a bit heavy so consider ending these conversations with a discussion of what your day or week looks like or reminisce and take a trip down memory lane.

有时这些对话会有点沉重，所以结束对话的时候讨论一下你一天一周是怎么样的，或者回忆一下旧时光。

youdao

Studies show that just five minutes of discussion with a primary-care doctor can reduce heavy drinking by 25%.

研究显示，只需同基础保健护理医生探讨5分钟，就能让那些饮酒量较大的人员把饮酒量减低25%。

youdao

Obviously, without a doubt, there will be I think a heavy discussion on the economy and on spending.

WHITEHOUSE: Press Briefing