Grab By The Lapels Meaning

(idiomatic) To exert control (over something)

Example: 2014, Daniel Taylor, "World Cup 2014: Uruguay sink England as Suárez makes his mark,", 20 June:
  Rooney, back in his central role, had a good opportunity soon afterwards but his left foot has never been a great weapon and Suárez was the only attacker here capable of grabbing the game by its lapels.