back-pocket verb 2back pocket noun 1forms 4 verb2 •To put (something) into a back pocket.“Right.” He back-pocketed the notebook and lifted the Nikon from my bag. “Take a few steps down the hill and point toward the ruins so I can get both in one shot.” — 2003 •To put (something) aside for future use; to keep in reserve. back pocket noun1 •A pocket found on the back of a pair of trousers. formsback-pocketed · back-pocketing · back-pockets · back pockets