The term 'put behind bars' is a phrase used to describe the act of imprisoning someone. The crossword solutions for this term are IMPRISON (8 letters), CAGE (4 letters), ENCAGE (6 letters), and CAGEDUP (7 letters). IMPRISON is the most common solution, as it is the verb form of the phrase. CAGE is a noun that describes a structure used to confine someone, while ENCAGE and CAGEDUP are variations of the same word. All of these words refer to the act of confining someone in a restricted area, such as a prison or jail.