ירמיהו י:ד פירוש: רש״י

with nails clous in French.

and with sledge hammers A hammer, marteau in French.

it does not bend Heb. יפיק, it does not kneel with its knees. Comp. (I Sam. 25:31) “a stumbling block (פוקה)”; (Nahum 2:11) “and tottering (ופיק) of the knees.”