A crow is a large black bird which makes a loud, harsh noise.

When a cock crows, it makes a loud sound, often early in the morning.

If you say that someone is crowing about something they have achieved or are pleased about, you disapprove of them because they keep telling people proudly about it.

If someone crows, they make happy sounds or say something happily.

If you say that a place is a particular distance away as the crow flies, you mean that it is that distance away measured in a straight line.