be a game changer(The experimental propulsion technology, referred to as a 'Quantum' space drive, is potentially a game changer, as it could alter the inertia of a spacecraft.coasttocoastam.comART Vancouver)
not know someone from Adam(кого-либо: I refused to lend that man money because I don't know him from Adam – Я отказался одолжить этому человеку деньги потому, что совершенно не знаю егоcnlweb)
a world apart(друг на друга: The two major cities of the Lowlands are are Glasgow and Edinburgh -- less than 50 miles apart in terms of travel, but a world apart in terms of their industry and architecture. (AA Illustrated Guide To Britain)ART Vancouver)