English▸ noun
1 any of a number of animals with yellow underparts:
this time of the year the main pursuit for a lot of anglers is yellowbelly.
2 informal, derogatory a cowardly person; a coward:
I was serious about my stand against the war and was not just a yellowbelly.
3 British English dialect a person from Lincolnshire in England:
I'm a Lincolnshire yellowbelly and people are proud of their county.
[mid 18th century: possibly from the fact that yellow-bellied frogs and eels are found in the Lincolnshire Fens, or that the uniform of the Lincolnshire Regiment includes the colour yellow]
▪ Irish English dialect a person from County Wexford in Ireland.
[early 19th century: possibly on account of the yellow sashes said to have been worn by men of Wexford when taking part in a hurling match]