A red letter day

To spill the beans

If we give them this concession, it will be <u><em>the thin end of the wedge</em></u>.

He has accomplished a <u><em>Herculean task</em></u>.

The university will have to <u><em>shelve</em></u> its plans for expansion in view of present si…

To lose one's head

I won't mind even if he <u><em>goes to dogs</em></u>.

To give currency

It <u><em>goes to his heart</em></u> to see so much misery.