Be in good company |
Be in the doldrums |
Be in the melting-pot |
Be like a cat on hot bricks; be on edge |
Be off like a shot |
Be on the straight and narrow (way) |
Be on the war-path |
Be on thin ice |
Be to somebody's liking/taste |
Be up one's street |
Be well in with somebody |
Believe it or not, |
Betray the fact that... |
Birth of a Nation. |
Bite/lick the dust |