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]
(..) have many lines, Bill. Everything is online. #Hi, Randy! Hi, guys. And how are you two? #I'm going forward. - I post this. Are you okay, honey? - Yes. - And you, champ? - I'm fine. What good! #On my way! (..)2014 Boyhood
(..) The impact has created a cloud of debris orbiting at twenty thousand miles per hour. Current debris orbit does not overlap with your trajectory. We'll keep you posted on any developments. - Copy that, Houston. Should we... Should we be worried? - No, let's let the boys down there worry for us. (..)2013 Gravity
(..) Breathe! Scully, can you breathe? Cold... - I'm cold... - I'll get you out. Abandon your posts! Evacuate! - What's happened? - It's all going to hell! - What about Mulder? - He won't make it. We gotta keep movin'. (..)1998 The X Files