Script (guión): Idioms, ‘Arm chair critic’. An Arm chair critic is someone who gives out advice but never actually proves that they can do any better themselves. My dad is an armchair critic when he watches football, he's always shouting at the TV. ‘cross it cross it, now, come on, too slow. You’ve got to be fast in this game. Ok. ok. now shoot shoot. I could have scored that…. rubbish.’