גַּ֭אֲוָה אֲפִיקֵ֣י מָֽגִנִּ֑ים סָ֝ג֗וּר חוֹתָ֥ם צָֽר׃
שטאָלץ זײַנען די פּאַנצערשופּן, צונױפֿגעשלאָסן װי מיט אַ זיגל אַ פֿעסטן;
Rashi
the strong Heb. אפיקים, like (below 40:18), “as strong as (אפיקי) copper; (ibid. 41:7), “He is proud of the strength of (אפיקי) His scales.”
Rashi
ויתאפק AND HE REFRAINED HIMSELF — He made a strong effort. The root in this sense occurs in (Job 41:7) אפיקי “the strong parts of the shields”. Similar also is (Job 12:21) “And He looseth the belt of the (אפיקים) strong”.