Learn what "but i don't know what to say" means, when people say it, and how to use it naturally in English.

This means the speaker is at a loss for words and does not know how to respond.
From A Love Once Betrayed, Episode 60
Someone admits they are unable to find the right words.
Use this in emotional or awkward conversations when you cannot answer right away. It is very common and natural.
Scenes unlock real expressions as you watch
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