A little knowledge is a dangerous thing

His comment on the current affairs always hits the right nail on the head

That boy is always going her own way. He won't listen to his parents' advice

A real man never goes back on his words

A word spoken is past recalling

John is a person who always works with undivided attention

I am happy to know that all have ended in smoke about him

Don't always do things by fits and snatches

Kill two birds with one stone

The error committed on impulse may turn out to be the sorrow of a whole life

You cannot please everyone

These people are cut from the same cloth/are tarred with the same brush

The accounts don't seem to be as clear as crystal

What you said is all Greek to me

Never make two bites of a cherry

He never goes back on his word. He is as good as his word

Plan your year in spring and your day at dawn

His words just leapt to the eye. Do you need me to explain it

become an overnight success

His performance at school really comes as a bombshell