Definition of by gum
- I looked it up, and by gum, she was right!
- By gum, I really mean it this time!
: the tissue that surrounds the necks of teeth and covers the alveolar parts of the jaws
: to enlarge gullets of (a saw)
: to chew with the gums
: any of numerous colloidal polysaccharide substances of plant origin that are gelatinous when moist but harden on drying and are salts of complex organic acids — compare mucilage 1
: any of various plant exudates (such as an oleoresin or gum resin)
: a substance or deposit resembling a plant gum (as in sticky or adhesive quality)
: to clog, impede, or damage with or as if with gum
: to exude or form gum
: to become gummy
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