After 74-year wait, Brentford return to top flight in style by humbling Arsenal
Arsenal suffered a humbling 2-0 defeat to newly-promoted Brentford on the opening
Kate's comment is correct.
Brentford have been out of the top division for 70 plus years, which makes them a bit of an underdog. Arsenal are one of the biggest names in football globally.
Brentford (the underdog) defeated Arsenal (the giants) which is a humbling blow. Arsenal are reminded that they are not unstoppable, even the underdogs are a threat, they should have taken this more seriously etc.
They are not as important or special as they thought, their self-opinion has been lowered. They have been humbled.