It means. I did not know . It is a dialect. The alternative is in the standard is لم أدرى و .. لم أعلم ___The meaning of these words in Arabic is: : You didnt.. انت مادرتشِ or لم تعلم : He didnt.. هو مادَراشِ or لم يعلم : She didnt هى مادِرتش or لم تعلم :They didnt مادروش or لم يعلموا :We didnt مادريناش or لم نعلم I hope the answer is useful to you.

It means in Algerian dialect :I have not done . دار did يدير do You didn't ما درتش He didn't ما دارش She didn't ما دارتش They didn't ما داروش :We didn't ما درناش

: أنت لم : هو لم : هي لم : هم لم : لم نكن

This expression is built of negation ما + the verb يدري in past tens . The meaning is i didn't know / I had no idea.

مادرتش means لم اعلم i did not know ------------------------ : You didnt الم تعلم : He didnt لم يعلم : She didnt لم تعلم :They didnt لم يعلموا :We didnt لم نعلم