at home—(predic.) very competent in smth. (with the implication that it makes a person feel confident and relaxed):
- Melanie is equally at home singing oratorio, jazz or performing in musical theater.
on home ground—
1. in the area where one works or lives:
- It was nice to renew acquaintances of students I’ve taught and to meet them on “home ground.”
2. = at home:
- Godber is on home ground, writing with cold-eyed affection about the Yorkshire mining communities.