PO , P.O. PO is an abbreviation for Post Office or postal order.
PO Box , P.O. Box PO Box is used before a number as a kind of address. The Post Office keeps letters addressed to the PO Box until they are collected by the person who has paid for the service.
If you describe someone as po-faced, you think that they are being unnecessarily serious about something.
Coltrane took a rather po-faced view of this.
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