Slacken (off) is a term used to describe the act of reducing effort or intensity. The crossword solutions for this term are EASE (4 letters), ABATE (5 letters), LETUP (5 letters), and LIEDOWNONTHEJOB (15 letters). EASE is defined as to make less difficult or intense, while ABATE means to reduce in amount, degree, or intensity. LETUP is similar to ABATE, but it also implies a temporary decrease in intensity. Finally, liedownonthejob is an idiom that means to be lazy or not work hard. All of these words and phrases can be used to describe the act of slackening off.