Lewis & Short

extento, āre, v. freq. a. [extendo], to stretch out, extend (ante- and post-class.).

  1. I. Lit.: nervos, Lucr. 3, 490: humeros angustos, Amm. 22, 14.
  2. II. Trop.: vires alieno ostio, i. e. to exert, try, Plaut. Bacch. 4, 2, 3: quid tu venisti huc te extentatum? id. Most. 3, 1, 66, v. Ritschl ad h. l.