To moan or complain about (something).
To be dismayed or worried about (someone), particularly because of their situation or what has happened to them.
To feel sorry about (any thing).
To feel sorry about (a thing that has or has not happened), afterthink: to wish that a thing had not happened, that something else had happened instead.
Emotional pain on account of something done or experienced in the past, with a wish that it had been different; a looking back with dissatisfaction or with longing.
The amount of avoidable loss that results from choosing the wrong action.