lengthen
v.
late 14c., from length + -en(1). Related: Lengthened; lengthening. Earlier verb was simply length (c.1300).
〔李〕[length n. 长度；-en ⇒“to come to have length；gain length获得长度”→] v. become long；grow longer变长；长起来
〔李〕[length n. 长度；-en ⇒“to come to have length；gain length获得长度”→] v. become long；grow longer变长；长起来