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keep someone posted
Fig. to keep someone informed (of what is happening); to keep someone up to date. If the price of corn goes up, I need to know. Please keep me posted. Keep her posted about the patient's status.
keep you posted
to make sure you know what is happening The doctors kept me posted about her condition.
Usage notes: usually refers to a situation that is quickly changing
keep somebody posted
to make sure that someone always knows what is happening (sometimes + on ) Keep me posted on anything that happens while I'm away.
Supply with up-to-date information, as in Keep me posted about your new job. This usage alludes to the accounting practice of posting the latest figures in a ledger. [Early 1800s]