en_tn/pro/26/07.md

Like the legs ... is a proverb in the mouth of fools

The phrases can be reordered. Alternate translation: "A proverb in the mouth of fools is like the legs of a paralytic which hang down" or "A proverb in the mouth of fools is as useless as the legs of a paralytic which hang down" (See: rc://en/ta/man/jit/figs-simile)

a paralytic

a person who is unable to move or feel all or part of his body

in the mouth of fools

Here "mouth" is a metonym for speaking. Alternate translation: "in the speech of fools" or "that fools say" (See: rc://en/ta/man/jit/figs-metonymy)