. "Trop. , to watch , be watchful or vigilant , to be on the alert : curam rei publicae summae defendundae jam pridem apud vos excubare, is watchful , active ." . "Trop. , to watch , be watchful or vigilant , to be on the alert : curam rei publicae summae defendundae jam pridem apud vos excubare, is watchful , active ." . .