underprop I. \| ̷ ̷ ̷ ̷| ̷ ̷\transitive verb Etymology:under (I) + prop 1.: to prop up from below : underpin 2.: uphold, support < underprop a reputation > 3.: to serve as a prop or support underneath II. \ˈ ̷ ̷ ̷ ̷ˌ ̷ ̷\noun : a prop placed underneath or supporting something