by halves

Thou fool, I ne'er do things by halves, Farthings are made for Irish slaves; No brass for me, it must be gold, Or fifty pounds in silver told.

c. 1724, Punch's Petition to the Ladies, Jonathan Swift

I have no notion of loving people by halves; it is not my nature. My attachments are always excessively strong.

1817, Jane Austen, chapter 6, in Northanger Abbey

Johnson, who, as we have before remarked, rarely praised or dispraised things by halves, broke forth in a warm eulogy.

1849, Washington Irving, chapter 26, in Oliver Goldsmith: A Biography

"When things happen to us in Latin America, it is never by halves. There is no equilibrium, so when it rains, towns get inundated and disappear, and when we have a revolution, half the population dies."

1989 July 30, Larry Rohter, “Theater: In Latin America, Headlines Inspire The Drama”, in New York Times, retrieved 05 Mar 2014

They don't do things by halves in the States. Whether it is cars, burgers or waistlines, Americans like to think bigger.

2006 Sept. 24, Gareth Chadwick, "Far-flung business: Making all the right moves, The Independent (UK) (retrieved 5 March 2014)