with obj.
1- make (something) longer, especially unusually so in relation to its width拉长, 使伸长, 使延长。
1.1
- prolong (a sound)延长（声音）：
she can sing-notes are elongated and given fullness without a quiver.
她很会唱歌——常延长音符, 并将它们唱得饱满而没有一丝颤抖。
1.2
- no obj. chiefly Biology grow longer【主生】变长。
- chiefly Biology long in relation to width; elongated【主生】细长的; 拉长的, 延长的：
elongate, fishlike creatures.
似鱼的细长生物。
词源
late Middle English （in the sense 'move away, place at a distance'）： from late Latin elongat- placed at a distance', from the verb elongare, from Latin e- （variant of ex-） 'away' + longe 'far off', longus 'long'.