Blabber
Part of speech: verb
Definition: to run one's mouth in such a way as to (inadvertently/unintentionally) spoil a surprise
Part of speech: noun
Definition: A person who blabs; a tattler; a telltale.
Rat
Part of speech: verb
Definition: to betray someone and tell their secret to an authority or an enemy; to turn someone in, bewray.To kill rats.
Part of speech: noun
Definition: Any of about 56 different species of small, omnivorous rodents belonging to the genus Rattus.A term indiscriminately applied to numerous members of several rodent families (e.g. voles and mice) having bodies longer than about 12 cm, or 5 inches.A person who is known for betrayal; a scoundrel.An informant or snitchA person who routinely spends time at a particular location.A promiscuous person - often a young female - who attends sporting and other entertainment events, primarily to seek sexual liaisons with athletes, entertainers and/or others traveling with them; a groupie.Informer.ScabNorth West London slang term for Vagina, as in get your rat out.A wad of shed hair used as part of a hairstyle.
Example sentence: You learned the two greatest thing in life, never rat on your friends, and always keep your mouth shut.