Yiddish: He reads Hebrew like an axe swims.

He's no good at reading Hebrew.  SOURCE: Furman, Yidishe Shprikhverter un Rednsartn.  Compare:

Er iz shtumpik af der ivre. | .ער איז שטומפּיק אויף דער עבֿרי
He's dull-witted when it comes to reading Hebrew.

SOURCE: Furman, Yidishe Shprikhverter un Rednsartn

ער זאָגט עבֿרי ווי אַ האַק שווימט.

Er zogt ivre vi a hak shvimt.

He reads Hebrew like an axe swims.