Cambridge English Dictionary: what is overreach: to fail by trying to achieve, spend, or do more than you can manage.
I'd say that describes their situation perfectly. Trying to do too much too soon. The Chelsea's and utd's of this world can buy their way out of trouble and do it very quickly. Moshiri thought he could do the same but he's starting from a totally different base level.
Moshiri thought he could replace £50m Stones with £25m Keane, £75m Lukaku with free Rooney, and injured Coleman with free Martina
He's certainly not trying to buy his way out of trouble


