Etymology
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blub (n.)

"fit of weeping," 1894, imitative or short for blubber (v.). As a verb by 1843. Related: Blubbed; blubbing.

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Definitions of blub

blub (v.)
cry or whine with snuffling;
Synonyms: snivel / sniffle / blubber / snuffle
From wordnet.princeton.edu