Real Dictionary

grieve
verb: If you are grieved by something, it makes you unhappy or upset.
verb: If you grieve over something, especially someone's death, you feel very sad about it.

grieve in American English
to cause to feel grief; afflict with deep, acute sorrow or distress
to feel deep, acute sorrow or distress; mourn
intransitive verb: to feel grief or great sorrow
transitive verb: to distress mentally; cause to feel grief or sorrow

grieve in British English 1
verb: to feel or cause to feel great sorrow or distress, esp at the death of someone

grieve in British English 2
noun: a farm manager or overseer