you can't be half pregnant

you can't be half pregnant

proverb This is a situation that requires a complete and utter commitment or total involvement. If we choose to break off from the company and establish our own firm, then that's what we have to commit to—you can't be half pregnant, you understand?
See also: half, pregnant
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

you can't be half pregnant

or

you can't be a little bit pregnant

People say you can't be half pregnant or you can't be a little bit pregnant to talk about situations which are very clear and definite or where you need to be completely involved. We did, however, pick up a valuable lesson: you can't be half-pregnant. To be successful in business, you must be able to give it your full commitment. He opposed sending in troops because, as he puts it, `there was no such thing as being a little bit pregnant': once the step had been taken, it would be impossible to set limits.
See also: half, pregnant
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012
See also:
Idioms browser ?
Full browser ?