verb (used with object)
to extend, reach, or expand beyond a proper, safe, or reasonable point: a company that overextended its credit to diversify.
to extend for too long a time: to overextend a stay.
to obligate (oneself) to more activities, work, etc., than one has time for or can accomplish well.

1935–40; over- + extend

overextension [oh-ver-ik-sten-shuhn] , noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To overextend
Example sentences
Gets good hand placement, but needs to keep his base wider as he will
  overextend, causing him to not sustain blocks for long.
Has enough speed to get to the second level, but tends to overextend and will
  miss some blocks in space.
If anything, he says, officials have had to caution them not to overextend
What some people have suggested is that they overextend this social mode of
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