blubber (n.)

late 14c., blober "a bubble, bubbling water; foaming waves," probably echoic of bubbling water. Original notion of "bubbling, foaming" survives in the figurative verbal meaning "to weep, cry" (c. 1400). Meaning "whale fat" first attested 1660s; earlier it was used in reference to jellyfish (c. 1600) and of whale oil (mid-15c.). Compare bubble.

blubber (v.)

"to cry, to overflow with weeping" (usually disparaging), c. 1400, from blubber (n.). In Middle English also "to seethe, bubble" (late 14c.). Related: Blubbered; blubbering.

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