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]
(..) -Yes! Yes! We promise! -Okay! Save your batteries. Very good, Woody. That's using the old noodle. Sergeant, establish a recon post downstairs. Code Red! -You know what to do. -Yes, sir! All right, men. You heard him. Code Red! Repeat, we are at Code Red. (..)1995 Toy Story