• swollen-headed

• hanging in the balance

• firing on all cylinders

• between he devil and the deep blue sea

• take the plunge

• speech is silver silence is golden

• the silent majority

• silence is golden

• strike a balance

• a Jekyll and Hyde

• the skull and crossbones

• trail and error

• the greek islands

• the villain of the piece

• redress the balance

• well and good

• the be all and the end all

• all and sundry

• knuckle under