length·en 
/ˈlɛŋθən/ verb
length·ens; length·ened; length·en·ing /ˈlɛŋθən/ verb 1 [no obj] : to become longer
▪ The days lengthened with the approach of spring. 2 [+ obj] : to make (something) longer
▪ Proper care will lengthen the life of the engine. ▪ lengthen a pair of trousers — opposite shorten
▪ The days lengthened with the approach of spring.
▪ Proper care will lengthen the life of the engine. ▪ lengthen a pair of trousers — opposite shorten
