While it's possible that decide can be traced back to caedere (to cut, kill), it's also plausibly related to cadere (to fall, die; more relevantly, come to pass

While it's possible that decide can be traced back to caedere (to cut, kill), it's also plausibly related to cadere (to fall, die; more relevantly, come to pass). The latter etymology also gives rise to words like "coincidence" (things happened together) and even "casual" (happened [by chance]). The Romans used a lot of euphemisms for death ("gave up his breath" is a common one, which gives rise to "expire").