Etymology
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Words related to gum

*ghieh- 

Proto-Indo-European root meaning "to yawn, gape, be wide open." 

It forms all or part of: chaos; chasm; dehiscence; gap; gasp; gawp; hiatus; yawn.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit vijihite "to gape, be ajar;" Greek khainein, Latin hiare "to yawn, gape;" Old Church Slavonic zinoti "to open (one's mouth);" Russian razinut', Serbo-Croatian zinuti, Lithuanian žioju, žioti, Czech zivati "to yawn;" Old English ginian, gionian "open the mouth wide, yawn, gape," Old Norse gina "to yawn," Dutch geeuwen, Old High German ginen "to be wide open," German gähnen "to yawn."

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bubble-gum (n.)
1935, from bubble (n.) + gum (n.). Figurative of young teenager tastes or culture from the early 1960s.
gum-drop (n.)
also gumdrop, type of confection, 1856, from gum (n.1) + drop (n.).
gummy (adj.)
"gum-like, sticky," late 14c., from gum (n.1) + -y (2). Related: Gumminess.
gumshoe (n.)
"plainclothes detective," 1906, from the rubber-soled shoes they wore (allowing stealthy movement), which were so called from 1863 (gums "rubber shoes" is attested by 1859); from gum (n.1) + shoe (n.).