Tunnel \Tun"nel\, v. t. [imp. & p. p. Tunneledor Tunnelled; p. pr. & vb. n. Tunneling or Tunnelling.]

1. To form into a tunnel, or funnel, or to form like a tunnel; as, to tunnel fibrous plants into nests. --Derham.

2. To catch in a tunnel net.

3. To make an opening, or a passageway, through or under; as, to tunnel a mountain; to tunnel a river.

Source: Webster's Revised Unabridged Dictionary (1913)