jackknife
noun
a large pocketknife.
Used to describe an ongoing action or continuous state that was happening at a specific time in the past.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
By the end of the piece, his upper body was jackknifing toward the keys at flourishes, with his left foot stomping.
From New York Times ● May 11, 2023