속을 썩여요 · 속을 썩였어요 · 속(이) 썩다 (to be distressed)
to cause someone worry or grief, to give someone a hard time
Example
어렸을 때 부모님 속을 많이 썩였어요.
I gave my parents a lot of grief when I was young.
Word parts
속 = one's insides; 썩이다 = to make rot, as if worry rots your insides.
Good to know
Don't confuse 썩이다 (to distress) with 썩히다 (to let rot or go to waste), a common spelling mix-up.