have get something down to a science Идиома

drop science

to demonstrate wisdom or skill

in all good conscience

Idiom(s): in (all) good conscience

Theme: MOTIVATION

having good motives; displaying motives that will not result in a guilty conscience.
• In all good conscience, I could not recommend that you buy this car.
• In good conscience, she could not accept the reward She had only been acting as a good citizen should.

have a clear conscience about

Idiom(s): have a clear conscience (about sb or sth) AND have a clean conscience (about someone or sth)

Theme: GUILTLESSNESS

to be free of guilt about someone or something.
• I'm sorry that John got the blame. I have a clean conscience about the whole affair.
• I have a clear conscience about John and his problems.
• I didn't do it. I have a clean conscience.
• She can't sleep at night because she doesn't have a clear conscience.

have a clean conscience about

A good conscience is a soft pillow.

You sleep well when you have nothing to feel guilty about.

Rocket science

If something is not rocket science, it is not very complicated or difficult to understand. This idiom is normally used in the negative.

conscience

conscience
see have a clear conscience; in conscience.

have a clear conscience

have a clear conscience
Also, have a clean conscience. Feel free of guilt or responsibility. For example, I have a clear conscience—I did all I could to help. This idiom is also put as one's conscience is clear or clean, as in His conscience is clean about telling the whole story. The adjective clear has been used in the sense of “innocent” since about 1400; clean was so used from about 1300.

in conscience

in conscience
Also, in all good conscience. In all truth or fairness, as in I can't in conscience say that the meeting went well, or In all good conscience we can't support their stand on disarmament. [Late 1500s]

More Idioms/Phrases

in commission in conscience in creation in default of in depth