You'd need someone who knows about hare coursing.

What I've always taken it to mean is the kind of rapid changing of direction that hares make, as they try dodge the dogs and escape, which I gather most of them do.

As mentioned in a verse of Master McGrath that isn't in the DT, where the term "turn" is used:

Then the hare she went on just as swift as the win.
He was sometoimes before her and sometimes behind.
Rose gave the first turn according to law -
Butb tne second was given by Master McGrath.

But I may of course be wrong. Apart from The Innocent Hare and Master McGrath, I know nothing about coursing.