mourn, lament, sorrow, be sorrowful, cry, sob, weep, sadden, upset, distress, pain, hurt, wound, and/or break someone's heart
some antonyms are to please and to rejoice
I will grieve later. The class will grieve for their slain classmate.
I will grieve during the funeral. The soldiers grieve for their fallen comrade.
Grieve is already a verb. For example "to grieve someone or something" is an action, therefore it is a verb.
Bill Grieve's birth name is William Thomas Turner Grieve.
Yes, the word grieve is a verb.
A simile.
Percy Grieve died in 1998.
Basil Grieve was born in 1864.
Basil Grieve died in 1917.
George Grieve was born in 1748.
George Grieve died in 1809.
Maud Grieve was born in 1858.