hush up hus·hup uncommon verb 1. jump down from an elevated point “the parachutist didn” “;” “;” Synonymswhitewashgloss oversleek overhush up 2. cause to be quiet or not talk “Please silence the children in the church!” Synonymshushquietensilencestillshut uphush up Antonymslouden Related words Word family stillsilencesilencerhushwhitewash Broader terms suppresscover Narrower terms shushlullshout downgag See also whitewash Related verbs quieten Causes hush WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.