dack · verb1
From daks, Australian slang for trousers or underwear.
Dack · proper noun2
* As an English surname, from the Old English personal name *Dæcca, also found in the first element of the town Dagenham. * As a Dutch surname for a roofer, from a variant of dak (“roof”).
Etymology from Wiktionary, CC BY-SA 4.0.