To come back to life after having died. / To become undead.

(heraldry) Alternative form of undé

A village in Magor with Undy community, Monmouthshire, Wales (OS grid ref ST4386).

(US, informal) An event where a large number of people, typically college students, run an outdoor route in their underwear.

plural of undie run

A community (civil parish) in Monmouthshire, Wales.

(idiomatic, humorous, informal) Synonym of get one's knickers in a twist

past participle of get one's undies in a bundle

Third-person singular simple present indicative form of get one's undies in a bundle

simple past tense of get one's undies in a bundle