Declan

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The Japanese word

さぞ

is pronounced
sazo | さぞ
means
certainly, no doubt
Examples:
もし彼が死んだらさぞ悲しむだろう。
moshi kare ga shin dara sazo kanashimu daro u.
I'll be deeply affected by his death. | I'll certainly be sad if he dies.
Examples sourced from tatoeba.org