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-I know her.
-Aren't you sipping the poison
a little quick, Romeo? You two just met.
What's the underlined mean?
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In Romeo and Juliet, by Shakespeare (try to read it, great play; movie/DVD, try the Zefirelli edition) the sipping of the poison (suicide) is really at the end of the love story.
Doing it too quickly means you're rushing your own love story in some way or another.
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Hi,

- I know her.



-Aren't you sipping the poison
a little quick, Romeo? You two just met.


What's the underlined mean?

Romeo loves Juliet so much that, when he mistakenly thinks she is dead, he kills himself by drinking poison.

Perhaps the speaker means 'You are falling too deeply in love too quickly, and it will end badly'.

Best wishes, Clive