I broke into tears.

我眼泪顿时流了下来。

youdao

I broke into tears and threw myself into his arms. I don 't know how long I sobbed, but after a while I became aware that he was crying too.

我泪如泉涌，扑入爸爸的怀抱，我不知道哭了多久，但过了片刻，我发现他也哭了。

youdao

When I gave her the money, she broke down into tears thankfully.

当我把钱给她时，她感激地流下了眼泪。

youdao

The representative asked me why I had decided to close the account, and I broke into tears.

FORBES: Breaking up in a digital fishbowl, revisited. (Or: How the New York Times filleted me on the front page of the Style section)