double-end·er \ˌ ̷ ̷ ̷ ̷ˈendə(r)\noun Etymology:double end (from double (I) + end) + -er 1. a.: a ship with bow and stern of similar shape b.: a self-propelled vehicle (as a streetcar) constructed and equipped to permit normal operation in either direction 2.ordouble-ender file\| ̷ ̷ ̷ ̷| ̷ ̷ ̷ ̷-\: a file with teeth cut from both ends toward the middle