When we lost our cat, we 'posted' (up) signs all over the neighborhood asking if people had seen him.
a horse's 'post position' [=the position of a horse in the line of horses at the start of a race]
No matter what happens, do not abandon your 'post'. [=do not leave your assigned area]
(..) - Right! - See, I'm deciding to leave now. - Beat it! God damn it. Replace this picture with the other one. Please post it yourself, and be discreet. As you want. Now throw the other picture in the trash. I'm loosing it. (..)2011 The Intouchables