Definition of half-seen:
(n) :
One of two usually roughly equal parts into which anything may be divided, or considered as divided.
(n) :
(sports) One of two equal periods into which a game is divided.
(n) :
(sports) One of the two opposite parts of the playing field of various sports, in which each starts the game.
(n) :
Half of a standard measure, chiefly:
(n) :
(British) half a pint of beer or cider. (Refusing a pint) Just a half, thank you. (Offering to top up a pint glass) Do you want a half in that? (Minimizing the amount of drink taken) A swift half at the Pear Tree.
(n) :
(liquor trade) A barrel measure of 27 gallons (half a hogshead).