that does it

1. Also, that does the trick. The last requirement has been fulfilled; that accomplishes it. For example, That does it; we're ready to send in the application now, or That last screw does the trick—it's fully assembled. Grose's Dictionary of the Vulgar Tongue (1823) defines do the trick as “accomplish a robbery or other business successfully,” and presumably the it in the first term stands for the trick. [Early 1800s] Also see that's that.

Example Sentences

Anybody needs something, I’m the person that does it.

Read more on Los Angeles Times

One of the things that does it for her is the way he works out an erogenous zone in her armpit.

Read more on Salon

“I was interested in characters that had great promise but ultimately didn’t achieve that promise. What happens to somebody afterward? How do they react to that? Do they let themselves be defined by not achieving that level, or do they try to reconcile that? Does it motivate them to excel in other areas of their life?”

Read more on Los Angeles Times

“We did the best job against the team that does it the best in the country,” Becker said.

Read more on Los Angeles Times

“It's not necessarily the playing that does it,” she explained.

Read more on Salon