[ 1st pref. un- + mother. ] Deprived of a mother; motherless. [ 1913 Webster ]
. (Chess) Checkmate given when movement of the king is completely obstructed by his own men. This can only occur when an opponent moves a knight into a position to give a check to the king. [ Webster 1913 Suppl. +PJC ]
. (Chess) Checkmate given when movement of the king is completely obstructed by his own men. This can only occur when an opponent moves a knight into a position to give a check to the king. [ Webster 1913 Suppl. +PJC ]