kasinsilyu (sp. var. katintilyu) 1comm. undershorts; underpants E gimmatang hi kasinsilyun nan inbabale na. She went to buy undershorts for her son. (sem. domains: 5.3 - Clothing.) 2intrans. to wear undershorts. Mungkasinsilyo ka eno. You wear your undershorts, okay? muN‑/nuN‑. Language Of Borrowing: Ilocano.