pin down

But pinning down the exact triggers for migration is challenging.

Wade through his Supreme Court appointments, he’s been harder to pin down on his plans for abortion in a second term.

With the polls showing a razor-thin difference between Harris and Trump among those who have indeed made up their minds, it’s hard to pin down exactly how many people may still be undecided.

“Rufus-Retro-Wainwright-Spective” will offer a crash course in a critically vaunted musician who has a passionate cult following — including many Hollywood stars — but who has always been a little hard to pin down.

It is not a thing you can pin down, you can get better at it, but will never be 100% perfect.