Idioms

Singing from the same hymn sheet:
If people are singing from the same hymn sheet, they are expressing the same opinions in public.
Example: Mostly people are singing from the same hymn sheet about Angie's case these days.

Talk the talk, walk the walk:
you say you can do something, you can do what you say you can do
Example: He can talk the talk, but can he walk the walk?

The elephant in the room:
An elephant in the room is a problem that everyone knows very well but no one talks about because it is taboo, embarrassing, etc.
Example: Issue that is happening now is an elephant in the room

All hands on deck:
Something that you say when everyone's help is needed, especially to do a lot of work in a short amount of time
Example: We've got to get all this cleared up before they arrive so it's all hands on deck.