WWordGenerator.org GeneratorsWord ListsBlogAboutGenerate a word Home / S / slack-up slack-up verb /slækəp/ 8 letters Scrabble 15 WWF 19 Definitions verb make less active or fast relaxslackslacken Look “slack-up” up elsewhere Wiktionary ↗ Merriam-Webster ↗ Etymonline ↗ Dictionary.com ↗ Want another word?Spin the dictionary for a fresh one. Generate a word →