weeding; undergrowth clearing
Refers to cutting down weeds, brush, or undergrowth, especially in forestry, agriculture, or land management contexts.
夏の間に下刈りをしないと、雑草が伸び放題になる。
If you don't do weeding during the summer, the weeds will grow unchecked.
Compound of 下 (した, 'under') and 刈り (かり, 'cutting'), referring to cutting undergrowth.