Significantly, however, arguments in favour of Turkish membership are beginning to gain ground.
Английский Язык - Английский Язык
Определение gain ground в Английский Язык Английский Язык словарь
obtain advantages, such as points, etc ; "The home team was gaining ground"; "After defeating the Knicks, the Blazers pulled ahead of the Lakers in the battle for the number-one playoff berth in the Western Conference"