Definition of "blub"

The grotesquely ornamented goats, crazed by the Hamelin piping, stampeded toward him. They piled up, shoving one another from the causeway, screaming with almost human agony as the black mud and the quicksand caught them, screaming till their shrieks blubbed into silence.

1935 November, Arthur Leo Zagat, chapter IV, in Dime Mystery Magazine

Yes. I know where she is. She's blubbing behind the gym. Shall I fetch her out?

1953, C. S. Lewis, chapter 1, in The Silver Chair

Baddle, Thompson-Wright and Wardle had been caned for giving cheek. Thompson-Wright had blubbed, the others hadn't.

1989, William Trevor, “Children of the Headmaster”, in Collected Stories, Penguin, published 1992, pages 1235–6

‘He... he made me cry, sir, and I was too embarrassed to come in blubbing, so I went and hid in the music-room until I felt better.’This was all terribly unfair on poor old Biffin, whom Adrian rather adored for his snowy hair and perpetual air of benign astonishment. And ‘blubbing’... Blubbing went out with ‘decent’ and ‘ripping’. Mind you, not a bad new language to start up. Nineteen-twenties schoolboy slang could be due for a revival.

1991, Stephen Fry, The Liar, London: Heinemann, page 35

[…] hang me, then, if I've the heart to come again to the old place, till I've had a thorough good blub, and that's the fact of it […]

1857, William Platt, chapter IX, in Mothers and Sons: A Story of Real Life‎, volume 1, London: Charles J. Skeet, page 150

He's not going out in bluey specs with the sweat rolling off him to baptise blacks, is he? The glasses would take their fancy, flashing. Like to see them sitting round in a ring with blub lips, entranced, listening.

1922, James Joyce, Ulysses (novel), Vintage International (1990), page 80