Definition of last post in English English dictionary
The sounding of a bugle, signalling the evening hour to bed down, also used at military funerals and remembrance services
Twenty minutes is allowed for the duration of the roll-call, the commencement and finish of which are sounded on the bugle, and are called the first and last ‘posts.’.
the tune played on a bugle at British military funerals, or to call soldiers back to camp for the night