rat
UK[ræt]US[ræt]
n
A small rodent with a pointed snout, long tail, and coarse fur, typically considered a pest.
n
A person regarded as treacherous or disloyal, especially one who betrays others.
v
To desert or betray one's party, cause, or associates.
Etymology
The word 'rat' has a long but obscure history in the Germanic languages. It likely entered Old English as 'ræt' from a common West Germanic source, though its ultimate origin is uncertain. Some scholars suggest a possible connection to the Latin 'rodere', meaning 'to gnaw', via an unattested Vulgar Latin form, but this remains speculative. The term has consistently referred to the rodent since its earliest recorded use, with its negative connotations of betrayal and desertion developing later, likely influenced by the animal's perceived sneaky and opportunistic nature.
Analysis
The word 'rat' is a simplex word of Germanic origin. It functions as a complete, unanalyzable root in modern English.
Examples
The laboratory used a white rat for the behavioral experiment.
He was called a rat for informing the police about the gang's activities.
Several members of the council are expected to rat on the agreement and vote against it.