English idioms : She’s a whistleblower ’t believe how Clare goes around with Alice.
Sam: I can
Kathy: Why is that? What’s wrong with Alice?
Sam: She’s a whistleblower and she rats on others in her department.
Kathy: Then, we have to warn Clare as soon as possible lest she slips up.
Sam: Yeah, the sooner the better.
Kathy: Actually! I’m afraid Clare is the villain of the piece but not the other way round. Obviously; she is covering up by spreading rumors about Alice.
Sam: You don’t say!
Go around with: to go places and do things with a particular person.
A whistleblower: a person who tells someone in authority about what is happening.
Rat on: to inform on (someone).
Lest: for fear that.
Slip up: make a careless error.
The sooner the better: right away; the sooner something [referred to] gets done, the better things will be.
The other way round: the opposite of what is expected or supposed.
You don’t say: used to express amazement or disbelief.
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