collapse (v)
break down (v)

Definition: collapse due to fatigue, an illness, or a sudden attack

lose (v)

Definition: miss from one's possessions
Example: I've lost my glasses again!.

buy the farm (v)
cash in one's chips (v)
choke (v)
conk (v)
croak (v)
decease (v)
die (v)
drop dead (v)
exit (v)
expire (v)
give-up the ghost (v)
go (v)
kick the bucket (v)
pass (v)
pass away (v)
perish (v)
pop off (v)
snuff it (v)

Definition: pass from physical life and lose all bodily attributes and functions necessary to sustain life
Example: She died from cancer. The children perished in the fire. The patient went peacefully. The old guy kicked the bucket at the age of 102.

lose (v)

Definition: suffer the loss of a person through death or removal
Example: She lost her husband in the war. The couple that wanted to adopt the child lost her when the biological parents claimed her.

lose (v)

Definition: fail to keep or to maintain
Example: She lost her purse when she left it unattended on her seat.

miss (v)
lack (v)

Definition: be without
Example: This soup lacks salt. There is something missing in my jewelry box!.

loss (n)

Definition: the experience of losing a loved one
Example: he sympathized on the loss of their grandfather.

losses (n)
losings (n)

Definition: something lost (especially money lost at gambling)

release (n)
passing (n)
loss (n)
going (n)
expiration (n)
exit (n)
departure (n)

Definition: euphemistic expressions for death
Example: thousands mourned his passing.