The Collaborative International Dictionary of English v.0.48:

Telescope \Tel"e*scope\, v. i. [imp. & p. p. Telescoped; p.
   pr. & vb. n. Telescoping.]
   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; to become compressed in the manner of a
   telescope, due to a collision or other force. [Recent]
   [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

telescoped
    adj 1: shortened by or as if by means of parts that slide one
           within another or are crushed one into another; "a
           miracle that anyone survived in the telescoped cars";
           "years that seemed telescoped like time in a dream" [syn:
           telescoped, shortened]