Main Entry: ²tunnel

Function: verb

Inflected Form(s): tunneled or tunnelled; tunnel·ing or tunnel·ling\ˈtən-liŋ, ˈtə-n^əl-iŋ\

Date: 1795

intransitive verb 1 : to make or use a tunnel
2 physics : to pass through a potential barrier <electrons tunneling through an insulator between semiconductors>transitive verb : to make a tunnel or similar opening through or under; also : to make (one's way) by or as if by making a tunnel

— tun·nel·er \ˈtən-lər, ˈtə-n^əl-ər\ noun