1 sentence for 落伍 (luò​wǔ — fall behind)

1. 行军时，他因为体力不支而落伍了。

   xíng​jūn shí, tā yīn​wèi tǐ​lì bù​zhī ér luò​wǔ le.

   During the march, he fell behind because he lacked the physical strength to keep up.

   Source: Dong Chinese Dictionary