not know the half of it
US /nɑt noʊ ðə hæf əv ɪt/
UK /nɑt noʊ ðə hæf əv ɪt/

1.
tidak tahu setengahnya, tidak tahu seluruhnya
to not know the full extent or all the details of a situation, especially one that is more serious or complicated than it appears
:
•
You think my job is tough? You don't know the half of it!
Kamu pikir pekerjaanku sulit? Kamu tidak tahu setengahnya!
•
She's been through a lot, but her friends don't know the half of it.
Dia sudah melewati banyak hal, tapi teman-temannya tidak tahu setengahnya.