An archaic or poetic term meaning to cheer or encourage someone.
From the prefix 'a-' (to, toward) combined with 'cheer' (to make happy or encourage), creating an intensified form meaning 'to make cheerful' or 'to hearten'.
Medieval poets used 'acheer' because they loved the musical quality of that 'a-' prefix—saying 'acheer the troops' sounded more uplifting and rhythmic than plain 'cheer' in verse and song.
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