Hi Dwi,

At the double is a phrase which means quickly, but in this case it also refers to the 'double' - 2 goals - that Haarland scored (otherwise known as a brace). So, 'Haaland at the double' both mentions he scored twice and that it was relatively easy.

Meek simply means weak (quiet, shy) and not aggressive, so Manchester United, the headline says, played weakly with no aggression and made it easy for their opponents.

Damon