(colloquial, vulgar, humorous) It is fruitless to speculate about counterfactual situations.

(UK) An expression of surprise or alarm.

The brother of someone's stepmother or stepfather. / The stepbrother of someone's mother or father.

plural of Uncle Scrooge

(informal) Joseph Stalin.

plural of Uncle Tom

(theology) A Christian doctrine, one of the five points of Calvinism, stating that Jesus Christ's substitutionary atonement on the cross is extended to those predestined to become a believer, at God's discretion and without condition.

(electronics) A gate array.

plural of uncommitted logic array

One who reproves in a blunt, stern manner intended for the benefit of the recipient.