そうだろうな

I suppose so

→ そう

phrase Rare #29,540

I suppose so An informal expression of agreement or resigned acceptance, meaning that something seems likely or obvious. The sentence-ending な adds a reflective tone, like “I guess” or “I suppose.”

JA: 彼が怒るのも、そうだろうな。

EN: I suppose it makes sense that he’s angry.

奴らはそうだろうな

I suppose they would.

— 続・夕陽のガンマン (1966)

そりゃそうだろうな。

Of course it would be.

そうだろうな普段の読書に―仕事が影響しない？

I suppose so. Doesn’t your work affect what you read in your everyday life?

— アバウト・タイム～愛おしい時間について～ (2013)

君ならそうだろうな！

That sounds like you!

— アイム・スティル・ヒア (2024)

そうだろうな

I figured as much.

— レザボア・ドッグス (1992)

当然そうだろうな

Of course it would be.

— コーカサスの虜 (1996)