Rotate your wrist to the right so that you're looking directly at your knuckles.
From the guardian.co.uk
On the airwaves and in print, his brass-knuckles commentary pummels adversaries.
From the time.com
I could tell he was really taken with a book when he didn't crack his knuckles.
From the theatlantic.com
The eyes then are drawn to a knife, artillery goggles and pair of brass knuckles.
From the post-gazette.com
Aching broken knuckles are easy to find meaningful-you punched someone's face in.
From the well.blogs.nytimes.com
I think I'm going to drag my knuckles into the kitchen for a glass of iced tea.
From the eatocracy.cnn.com
Until around 500 BC himantes were used as protection for the knuckles and hand.
From the en.wikipedia.org
Instead they seem prepared to bite their knuckles and grimace for a long while.
From the edition.cnn.com
Mine, I think, from digging my knuckles deep into cracked earth while under fire.
From the heraldtribune.com
More examples
Press or rub with the knuckles
A joint of a finger when the fist is closed
Shoot a marble while keeping one's knuckles on the ground
The knuckles are the joints of the fingers which are brought into prominence when the hand is clenched and a fist is made. The word is cognate to similar words in other Germanic languages, such as the Dutch "Knokkel" (knuckle) or German "Knu00F6chel" (ankle), i.e., Knu00F6chlein, the diminutive of the German word for bone (Knochen)...
Any of the joints between the phalanges of the fingers; A mechanical joint; A cut of meat; The curved part of the cushion at the entrance to the pockets on a cue sports table; To apply pressure, or rub or massage with one's knuckles
(Knuckles) [Slang], lumpy protrusions on the edges, and sometimes the underside, of a thunderstorm anvil. They usually appear on the upwind side of a back-sheared anvil, and indicate rapid expansion of the anvil due to the presence of a very strong updraft. They are not mammatus clouds. ...
(KNUCKLES) Indecision; lack of focus; wasting time rather than 'knuckling down' / Yielding or submitting to something, perhaps without fully thinking it through; being told off; acting stupidly / If white: Extreme anxiety or fear
(Knuckles) Raised loops of a woven textile structure.
(Knuckles) mountain range lies east of Kandy and Matale, separated from the central hills by the Dumbara valley. It extends 19 km from Laggala in the north to Urugala in the south. Its popular name Dumbara hills, is derived by it being perpetually covered in mist. ...