Idiom Question: What does "run with that" mean?

a celebrity said that " I have a crush on you" the second celebrity said "uh-oh, now they'll run with that" the first celebrity said "oh yeah, now everythings ruined" what does "run with that" mean? I haven't heard this before... Im not even sure if its an idiom show more a celebrity said that " I have a crush on you"
the second celebrity said "uh-oh, now they'll run with that"
the first celebrity said "oh yeah, now everythings ruined"

what does "run with that" mean?
I haven't heard this before...

Im not even sure if its an idiom
8 answers 8