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Related to snick up: sneak up
obsolete An indignant exclamation of dismissal; to shut up or go away. Used imperatively. A: "Lo, thou art but a bare-faced upstart, an impertinent knave." B: "Snick up, old fool! Thou art surely no authority of propriety, given thy past dealings."
See also: up
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.