The Collaborative International Dictionary of English v.0.48:

overuse \overuse\ ([=o]"v[~e]r*[=u]s"), n.
   Excessive use.
   [PJC]

The Collaborative International Dictionary of English v.0.48:

overuse \o`ver*use"\ ([=o]`v[~e]r*[=u]z"), v. t.
   To use excessively; to use too often; as, scientists tend to
   overuse technical terms.
   [PJC]

WordNet (r) 3.0 (2006):

overuse
    n 1: exploitation to the point of diminishing returns [syn:
         overexploitation, overuse, overutilization,
         overutilisation]
    v 1: make use of too often or too extensively [syn: overuse,
         overdrive]