A: Germs, oh, what're germs?

B: The things that cause infection.

A: Infection is caused by germs? Oh, are germs poisonous?

B: Very.

A: I don't see any poisonous germs.

B: Oh, much too small to be seen, but they're everywhere.

A: Oh, they are? Well you, you can't be too careful. Prevention

is better than cure. I'll say.


What does "I'll say" mean in this dialogue?

Thank you


"I'll say!" is normally used to emphatically agree with what someone just said. It would make more sense in your dialogue if it was said by B rather than A. If said by A, it could be understood to emphasise the previous statement, but the punctuation is wrong (would have to be a comma). This and certain other aspects of this dialogue make me doubtful whether it was written by a competent (or careful) native speaker.

rezaenglishWhat does "I'll say" mean in this dialogue?

It is not natural there. "I'll say" means "I heartily agree", and you can't agree with yourself. I think the writer must have meant "I say" or "I always say", with a comma (Prevention is better than cure, I always say.), which means that these are words you live by. By the way, there is a proverb, "An ounce of prevention is worth a pound of cure", and it sounds like these people never heard it, which is also not natural.

Students: Are you brave enough to let our tutors analyse your pronunciation?
 GPY's reply was promoted to an answer.

Thank you, GPY

Yes, it was said by A.

Thank you

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