do nothing/not do anything by halves
not do anything by halves
To not do anything half-heartedly or without maximum effort. Of course Stephanie always gets straight A's—she just can't do anything by halves.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
do nothing/not do anything by ˈhalvesdo whatever you do completely and thoroughly: She does nothing by halves. When she decided to write a book, it was 1 000 pages long.
Farlex Partner Idioms Dictionary © Farlex 2017