Express regret about (6)
I believe the answer is:
lament
(Other definitions for lament that I've seen before include "Mourn , bewail the loss of" , "Mourn, grieve for" , "Mourn (a person's death)" , "Cry of sorrow" , "Mourning song or poem" .)
I believe the answer is:
lament
(Other definitions for lament that I've seen before include "Mourn , bewail the loss of" , "Mourn, grieve for" , "Mourn (a person's death)" , "Cry of sorrow" , "Mourning song or poem" .)