Definition of stymieing:
(v) :
To thwart or stump; to cause to fail or to leave hopelessly puzzled, confused, or stuck.
(n) :
(by extension) An obstacle or obstruction.
(n) :
(golf) A situation where an opponent's ball is directly in the way of one's own ball and the hole, on the putting green (abolished 1952).
(v) :
(golf) To bring into the position of, or impede by, a stymie.