to squat; to crouch down (completely, generally with face looking through knees)
疲れてしゃがみ込んだ。
I was so tired I crouched down.
子供がしゃがみ込んで虫を観察していた。
The child was squatting down watching a bug.
急に腹痛に襲われ、道端にしゃがみ込んでしまった。
Hit by a sudden stomachache, I ended up crouching down by the roadside.