have at it

“I’m going to tell him to go have at it and let it rip,” Harbaugh said.

There are many ways to let chicken and noodles have at it: You can boil the bird and cook noodles in the resulting stock.

“We want to get to that center of player development, that weight room, and let’s have at it. ‘You hungry?

“If Putin thinks he can do better at the deep fryer, let him have at it,” he said in an interview.

Mr. Oliver encouraged the revolt, posting photos of himself in various get-ups — pink panda-print pajamas, a wizard’s hat with a purple cape — on Twitter, along with the message “Dear Reddit, excellent work. Attn: r/pics — have at it…”