From Longman Dictionary of Contemporary Englishoverextendo‧ver‧ex‧tend /ˌəʊvərɪkˈstend $ ˌoʊ-/ verb [transitive]1TOO/TOO MUCHto try to do or use too much of something, causingproblems, illness, or damageoverextend yourselfBe careful not to overextend yourself. You’ve been very ill.2to spend more money than you actually haveJackson’s company became overextended financially. —overextended adjective→ See Verb table
Examples from the Corpus
overextend• I try not to overextend myself.• The samefreedom from joblimits that unleashesenormouseffort also encourages people to overextend themselves.overextend yourself• It's common for out-of-work families to overextend themselves.• I try not to overextend myself.• The same freedom from job limits that unleashes enormous effort also encourages people to overextend themselves.