adjective
not stretched or held in a tight position :loose
not busy :lacking the expected or desired activity
doing something poorly because you are not putting enough care or effort into it
done poorly and carelessly
noun
plural slacks
[noncount] :the part of a rope, chain, etc., that hangs loosely
slacks [plural] chiefly US :pants or trousers
give/cut (someone) some slack
informal :to treat (someone) in a less harsh or critical way
pick/take up the slack
to provide or do something that is missing or not getting done
verb
slacks; slacked; slacking
[no obj] :to give little or no effort or attention to work
slack off
[phrasal verb]
to do something with less effort or energy than you did it with before
to become less active, forceful, etc.