자책해요 · 자책했어요 · 자책할 거예요 · 자책하세요
to blame oneself, to reproach oneself
Example
실수는 누구나 하니까 너무 자책하지 마세요.
Everyone makes mistakes, so don't blame yourself too much.
Word parts
자 self+책 blame
Literally 'blame oneself'.
Good to know
Very common as comfort: 자책하지 마세요 (don't beat yourself up). Pronounced [자채카다].