telescoping

Telescope \Tel"e*scope\ (t[e^]l"[-e]*sk[=o]p), a.
   Capable of being extended or compacted, like a telescope, by
   the sliding of joints or parts one within the other;
   telescopic; as, a telescope bag; telescope table, etc.; --
   now more commonly replaced by the term {telescoping}.
   [Webster 1913 Suppl.]
    

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]
    

Telescoping \Tel"e*scop`ing\ (t[e^]l"[-e]*sk[=o]p`[i^]ng), a.
   Capable of being extended or compacted, like a telescope, by
   the sliding of sections or parts one within the other;
   telescopic; as, telescoping tripod legs; a telescoping table,
   etc.; -- a term replacing the formerly used {telescope}.
   [Webster 1913 Suppl. +PJC]