Hide my face, i.e. withdraw my favour and help.
Related Commentaries of Deuteronomy 31:17
Deuteronomy 31:17
17 Then my anger shall be kindled against them in that day, and I will forsake them, and I will hide my face from them, and they shall be devoured, and many evils and troubles shall befallb them; so that they will say in that day, Are not these evils come upon us, because our God is not among us?