step in

She couldn't do it, so I stepped in.

Pretty Little Liars S4E11

♪ So step in line ♪

Silicon Valley S3E8

It's a big step in my life.

Full House S1E11

I haven't exactly found a spell that can undo an anti-magic border per se, but this book mentions Travelers, which isn't that helpful, but at least it's a step in the right direction.

The Vampire Diaries S6E1

I'm telling you, this is the first step in my quest

New Girl S4E5

That's a step in the right direction, Alexis.

Schitt's Creek S4E8

It was the first thing I noticed when I stepped in here.

Doctor Who S8E4

We know you stepped in and saved Lazebnik from getting a beating about a year ago.

Bones S7E7