Definition of by gum
informal + old-fashioned
—used to show surprise or determination I looked it up, and by gum, she was right! By gum, I really mean it this time!
Word by Word Definitions
: the tissue that surrounds the necks of teeth and covers the alveolar parts of the jaws
: the alveolar portion of a jaw with its enveloping soft tissues
: 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 (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
Seen and Heard
What made you want to look up by gum? Please tell us where you read or heard it (including the quote, if possible).