etad uktaṃ bhavati yady agṛhītasaṅketam arthaṃ śabdaḥ pratipādayet, tadā gośabdo 'py aśvaṃ pratipādayet.
This is what is being said: if a word were to convey a meaning for which no convention has been grasped, then the word "cow" would also denote [the meaning] "horse."