- 落伍 [luò wǔ]
- fall behind the ranks; straggle; drop behind; drop out:
When the revolution is developing rapidly，some people are bound to fall behind. 在革命急速发展的时候，总不免有人要落伍的。
The same is the case of men, that rise after calamities and misfortunes. For they are as men fallen out with the times; and think other men's harms, a redemption of their own sufferings.
The development of new machinery has outdated many plants.