I happened to overhear what he said.

我碰巧听到了他所说的话。

youdao

I chanced to overhear them talking about you.

我碰巧听到他们在谈论你。

youdao

Not everyone is going to find that funny, though quite rightly it's not something you expect to overhear in an arcade.

不是每个人都能从中发现乐趣，但本作确实不是你期望在商场街机厅中偷听到的那种。

youdao

The hanger-on who waits until the gallery opening is finishing to overhear where the free dinner with be.

WSJ: Book Review: The Value of Art

This time I was close enough to overhear their conversation, so I knew that one man was in sales and the other was a potential client.

FORBES: Knowing When to Back Off

However, there are those of us who will say aloud what many development practitioners will whisper when no one is around to overhear them: the private sector is the only truly sustainable source of economic growth.

FORBES: At the UN Sustainable Development Summit, Private Sector Advocates Must Be Heard