Noun
Examples
He's off the twig! He's kicked the bucket, he's shuffled off his mortal coil, rung down the curtain and joined the choir invisible! This is an ex-parrot!Monty Python, Dead Parrot sketch
synonymia (plural synonymiae)
(rhetoric) The use of two or more synonyms together to amplify or explain a given subject or term. A kind of repetition that adds force.