Telescope

Part of speech: noun (n.)

An optical instrument used in viewing distant objects, as the heavenly bodies.

Part of speech: verb (v.)

To cause to come into collision, so as to telescope. [Recent]

Part of speech: adjective (a.)

To slide or pass one within another, after the manner of the sections of a small telescope or spyglass; to come into collision, as railway cars, in such a manner that one runs into another. [Recent]