"gumming" in the noun sense
1. mumbling, gumming
ineffectual chewing (as if without teeth)
"gumming" in the verb sense
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"
exude or form gum
"these trees gum in the Spring"
Source: WordNet® (An amazing lexical database of English)
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