Where does “chewing sponge” come from?

chewing sponge (English) comes from English sponge, from Old English spunge, from Latin spongia, from Ancient Greek σπογγιά, from Ancient Greek -ῐ́ᾱ, from Proto-Indo-European -íh₂, from Proto-Indo-European -h₂ — Creates collective nouns, which refer to groups...

chewing sponge (English): A bunch of twigs (most commonly of Salvadora persica) that were beaten until fibrous used as a traditional product for dental hygiene purposes

Definitions

  1. A bunch of twigs (most commonly of Salvadora persica) that were beaten until fibrous used as a traditional product for dental hygiene purposes

Ancestry of “chewing sponge”, step by step

chewing sponge traces back through two separate lines of ancestry.

via English sponge

StepLanguageWordMeaning
1EnglishspongeAny of various marine invertebrates, mostly of...
2Old Englishspunge
3LatinspongiaA sponge; pumice, or other things resembling a...
4Ancient Greekσπογγιάsponge
5Ancient Greek-ῐ́ᾱ{{l|en|-ia}}; "suffix forming abstract feminine...
6Proto-Indo-European-íh₂
7Proto-Indo-European-h₂Creates collective nouns, which refer to groups...

via English chewing

StepLanguageWordMeaning
1Englishchewingpresent participle of chew; The act by which...
2Middle EnglishchewyngThe act of chewing; One's ability to detect...
3Old Englishċīwung
Every word from Proto-Indo-European -h₂Every word from Ancient Greek -ῐ́ᾱEvery word from Ancient Greek σπογγιά