over-extend

verb (used with object)

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

v.“to take on too much” (work, debt, etc.), 1937, from over- + extend. Related: Over-extended; over-extending.