This gem was overheard on MSNBC. Correspondent Katy Tur was commenting on the Republican National Committee (RNC) walking a tight rope with respect to Donald Trump, and ended by uttering this malaphor. It is a congruent conflation of “thread the needle” and “walk a fine line”, both meaning to strike a balance between conflicting or different forces. Perhaps she was thinking of threading a fishing line? A big thank you to Louis Mande for hearing this one and passing it along.