hyper- + extend
hyperextend (third-person singular simple present hyperextends, present participle hyperextending, simple past and past participle hyperextended)
- (medicine) To extend a joint beyond its normal position in a way that stresses the ligaments, often causing injury
2007 August 17, Ben Shpigel, “Castillo Pulls for Polanco to Continue His Streak”, in New York Times:
- DELGADO OUT OF LINEUP The day after hyperextending his left knee as he tried to catch a foul ball, Carlos Delgado was held out of the starting lineup.