Betray verb - To be unfaithful or disloyal to.
Usage example: childhood friends of movie stars often betray them by telling their secrets to the supermarket tabloids
Rat is a synonym for betray in trust topic. In some cases you can use "Rat" instead a verb "Betray", when it comes to topics like desert. popular alternative
Both words in one sentence
- His refusal to rat out his friends to the police nearly got him imprisoned and it's clear that even the threat of death won't make him betray the Kingsmen, particularly Harry.
Source: Undying Loyalty
- Dumbass Has a Point: In the first game, the other villains talk the Rat into trying to betray you, than threaten him into overextending himself against a lord who rises in your support when he hears about the betrayal.
Source: Video Game / Stronghold
Google Ngram Viewer shows how "betray" and "rat" have occurred on timeline