knuckle
noun
a joint of a finger, especially one of the articulations of a metacarpal with a phalanx.
Used to describe an action that began in the past, has continued continuously, and is still in progress.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The name of the island is true to myth, which suggests that someone at DC Comics has been knuckling down to Herodotus and the Greek tragedians.
From The New Yorker ● Jun. 5, 2017