Podemos dizer: TO BE A SITTING TARGET. Ou seja, quando alguém é a sitting target, é muito fácil de atingi-la com qualquer coisa, criticas, de enganá-la, é fácil pegá-la.
O Cambridge Advanced Learner’s Dictionary diz:
A person or thing that is without protection and easily attacked. Ex.: In his open car, the President was a sitting target for assassins. Ex.: If you don’t lock your doors and windows, you’ll be a sitting target for burglars.