Dutch Etymology Compound of onder + rok. Pronunciation IPA(key): /ˈɔn.dəˈrɔk/ Audio:(file) Hyphenation: on‧der‧rok Noun onderrok m (plural onderrokken, diminutive onderrokje n) a women's undergarment worn under a skirt; a slip, a petticoat Descendants → Indonesian: onderokWikiwand - on Seamless Wikipedia browsing. On steroids.