living off others' money or generosity without contributing yourself; or absorbing liquid like a sponge does.
From the sponge animal, which absorbs water passively. By metaphor, someone who 'sponges' off others absorbs their resources without effort.
Real sponges are actually animals, not plants—and they're ancient, existing for 600 million years, making them older than most other life forms on Earth.
Historically applied disproportionately to women ('sponger' as a dependent wife or mistress), reflecting gendered assumptions about labor, contribution, and economic parasitism.
Use 'freeloading', 'dependent on', or name specific behavior. Avoid as character judgment when gendered assumptions may apply.
["freeloading","relying on support without reciprocating"]
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