Idiom of the Day
play off (one group against another)
to match opposing persons or forces or interests for one`s own gain
Nobody likes the supervisor because he is always trying to play off one group of workers against another.
Rules to play Taekwondo
The Competition Area for the Olympic Games shall be installed on a platform 1m high from the base, and the outer part of the Boundary Line shall be over 2m wide, being inclined with a gradient of less than 30 degrees from point of over 2m from the Boundary Line, for the safety of the contestants.