make or become longer 使变长 [with obj.]she lengthened her stride to catch him up. 她迈开脚步以追上他。 [no obj.]in the spring when the days are lengthening. 春天里白天越来越长。 [as adj. lengthening]the lengthening shadows. 影子渐长。 ■[with obj.](Prosody & Phonetics)make (a vowel or syllable) long (诗韵,语音)使(元音,音节)拖长