Definition of "summat"

...every gentleman tips us summat, we looks for it as natural as possible.

1809, Theodore Hook, “Killing No Murder”, in The Sporting Magazine, volume 34, number 202, page 185

They require the atmosphere of a cigar and the amalgam of a sum'mat comfortable.

1825 October 12, Walter Scott, Letters (published 1935), IX.245

A man must learn summat beside Gospel to make them things.

1859, George Eliot [pseudonym; Mary Ann Evans], chapter I, in Adam Bede […], volume I, Edinburgh, London: William Blackwood and Sons, book first, page 10

He were a-going to gie I summat for’n, but like enough it’ll be worth more to a gent like yourself.

1929, John Cowper Powys, Wolf Solent, page 129

Does he think I’ve been soaping up to the Governor or summat?

1947, Thomas Armstrong, King Cotton, page 53

Got summat fer yeh here – I mighta sat on it at some point, but it’ll taste all right.

1997 June 26, J. K. Rowling [pseudonym; Joanne Rowling], chapter IV, in Harry Potter and the Philosopher’s Stone (Harry Potter; 1), London: Bloomsbury Publishing

Why go all the way to find summat that ain’t there?

2006, Robin Jarvis, Thomas, page 20

It's summat-like to see such a man as that i' the desk of a Sunday!

1859, George Eliot [pseudonym; Mary Ann Evans], chapter VIII, in Adam Bede […], volume I, Edinburgh, London: William Blackwood and Sons, book first, page 172