TUNNEL — Definition of TUNNEL
noun
1
An underground or underwater passage.
2
A passage through or under some obstacle.
3
A hole in the ground made by an animal, a burrow.
4
A wrapper for a protocol that cannot otherwise be used because it is unsupported, blocked, or insecure.
verb
1
To make a tunnel through or under something; to burrow.
2
To dig a tunnel.
3
To transmit something through a tunnel (wrapper for insecure or unsupported protocol).
4
To insert a catheter into a vein to allow long-term use.
📚 Source: en.wiktionary.org/wiki/tunnel
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