look (oneself)
To have one's normal appearance of health or wellbeing. Often used in negative constructions. Are you feeling all right, Janet? You're not looking yourself today. After a couple days of proper rest, Jim was looking himself again.
(not) look yourˈself
(informal) (not) look as healthy as you normally do: She wasn’t looking herself at all yesterday.He looks more himself this morning. His temperature’s come right down.look
alive/sharp Informal To act or respond quickly: Look alive! We leave in five minutes.