Wiktionary
n. 1 (plural of knacker English) 2 (context pluralonly British English) testicles. vb. (en-third-person singular of: knacker)
Wikipedia
Usage examples of "knackers".
Well, I mean, at that point Indian Silk was worth just what the knackers would pay for his carcass, which wasn’t much, and this man was offering nearly twice that.
But the man said he knew Indian Silk couldn’t race anymore but he’d like to give him a good home in a nice field for as long as necessary, and it meant that Dad didn’t have the expense of any more vets’ bills and he and Mum didn’t have to watch Indian Silk just getting worse and worse, and Mum wouldn’t have to think of him going to the knackers for dog meat, so they let him go.
Well, I mean, at that point Indian Silk was worth just what the knackers would pay for his carcass, which wasn't much, and this man was offering nearly twice that.
But the man said he knew Indian Silk couldn't race anymore but he'd like to give him a good home in a nice field for as long as necessary, and it meant that Dad didn't have the expense of any more vets' bills and he and Mum didn't have to watch Indian Silk just getting worse and worse, and Mum wouldn't have to think of him going to the knackers for dog meat, so they let him go.
I told Tigwood to take the last two to the knackers to put them out of their misery.
He gloomily watched the knackers position their van by my garden gate and winch the thin old corpse away.
On busy days, the knackers dropped ten, twelve horses down there, and none of them ever came back up.
And that night when you kept fighting and fighting, butting old Duff in the teeth and kneeing me in the knackers, I felt something—"
Desmi was becoming a problem—just look at last night: Burdale Ruff had kicked Clyve Wheat in the knackers because he'd thought Clyve was looking at Desmi the wrong way.
Amafi also discovered that he ran a gang of knackers, men who carried away dead animals, horses and cattle for the most part, that had died in traces or in the field.