Bunk/bʌŋk/ Definition 1 of 4Pro Tip 1/2Space-saving design Bunk refers to beds designed to save space, commonly found in shared rooms or hostels. Hostels often provide bunk beds to accommodate more travelers. Pro Tip 2/2Stacked sleeping When describing bunk, think of one bed above another, with a ladder for access. I slept in the top bunk and had to climb up each night.