knucks

Last pound, knucks, or high five: Daniel Castillo or Yoon Sul-I can't remember.

From Time Magazine Archive

Anyhow, they were out for success and scraps and scads, and they tackled the city like two Lochinvars with brass knucks and a pull at the City Hall.

From Strictly business: more stories of the four million by O. Henry

The young man from Mechanicsville found the lawyer in the street playing "knucks" with a troop of children and laughing heartily at the fun they were all having.

From The Story of Young Abraham Lincoln by Wayne Whipple

I didn't find no knucks on him, and you didn't.

From Trail's End by George W. (George Washington) Ogden

Very well," was the significant remark of my friend, "I know of a few knucks who are in town, and whom you were the means of burning out a few months since.

From The Gold Hunters' Adventures Or, Life in Australia by James Wells Champney