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post (something) to (one)
To send something to one via the postal system; to mail something to one. I posted that package to you weeks ago—it must have gotten lost in the mail. I'm posting a letter to you this morning with details of our trip.
See also: post
1. To send something through the postal service. A noun or pronoun can be used between "post" and "off." We need to post off these revised contracts ASAP! I just posted a card off this morning. I'm hoping it gets to you before your birthday.
2. obsolete To postpone or delay something needlessly; to put something off. A noun or pronoun can be used between "post" and "off." We cannot post off such vital work. It is of the utmost importance that it be completed as quickly as possible.
post on (something)
1. To share information on a public place, thing, or platform. He spends so much time posting on social media that he has started letting his relationships in real life deteriorate. You should try posing on the notice board in the post office—I've seen a lot of great services advertised there.
2. To share a particular piece of information on a public place, thing, or platform. He posted some pretty inflammatory comments on Facebook over the weekend. We're posting pictures of our missing dog on buildings and lampposts all over town.
In basketball, to assume an offensive position between the free throw lane ("the paint") and the basket (an area known as the low post) with one's back to the basket and a defending player, so as to receive the ball in a position where one can attempt to shoot or move closer to the basket. If you've got a size advantage, post up and I'll get the ball to you.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
post something up
to record a transaction in an account. I'll post this charge up right away, and then you can check out. Please post up the charges a little later.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.