to fill a hole created by digging or drilling, especially using some of the material that has been taken out

Dig a large hole for the plant, then backfill with soil and compost. 给植物挖一个坑，然后用泥土和肥料回填。

Finally, backfill the trench. 最后回填深沟。

to replace workers after jobs have been made available

Chrysler says it intends to backfill jobs vacated by the buyouts. 克赖斯勒汽车公司宣布，在买断之后计划将招聘新的员工填补职位空缺。

material used to fill a hole that has been created by digging, etc.

Some of the fluorite produced from the lead mines was used as backfill underground. 铅矿产生的一部分萤石曾被用来作为地下回填材料。