"gummed" in the verb sense
1. gum
cover, fill, fix or smear with or as if with gum
"if you gum the tape it is stronger"
2. mumble, gum
grind with the gums chew without teeth and with great difficulty
"the old man had no teeth left and mumbled his food"
3. gum
become sticky
4. gum
exude or form gum
"these trees gum in the Spring"
"gummed" in the adjective sense
1. gummed, gummy
covered with adhesive gum
Source: WordNet® (An amazing lexical database of English)
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