Hang somebody out to dry - Idioms by The Free Dictionary
hang somebody out to dry
hang (one) out to dry
To desert one in a troubling situation. He says he's my friend, but then he totally hung me out to dry in that meeting! Not one word of support as the boss tore into me!
hang somebody out to ˈdry (American English, informal) leave somebody in a difficult situation without your support, especially to avoid receiving any blame yourself: It was his own party who hung him out to dry for losing the election.