verb · to descend or drop down from a higher position due to gravity

秋天到了，树叶纷纷从树上落下。

verb · to come to rest on a surface after flight or falling, particularly of projectiles

掷出的铁饼在远处的一片草地上落下。

verb · to lag behind or fall short of a schedule, standard, or level

他想通过加班来补偿落下的进度。

verb · to fall behind or miss a portion of something (like work or studies) due to absence or neglect

他因为住院落下了一个月的功课。