metaphor
Spill the beans, perhaps?
do not spill th beans becuase it is an important secret..
Spill the Beans - EP - was created on 1993-08-25.
Another word for snitch that rhymes with "kill" could be "chill."
Fmylife.com
Don't Spill the Beans - 1965 was released on: USA: 26 May 1965
Don't spill the beans[ tell everything you know ] or we'll end up in the slammer[jail] .
Truth.
It is believed to be from the greek voting method using beans.
blab
You can't because it's not an idiom. Perhaps you mean "spill the beans," which means to divulge a secret that you weren't supposed to talk about. In that case, you might say "Don't spill the beans" or "Bobby spilled the beans and told Rachel about her surprise party."
When Marjory accidentally tipped over her glass, she spilled milk everywhere.