"doing the minimum"

Hi. I am looking for one or more snappy phrases for "doing as little as possible", or the minimum, or "just getting by". As in unconscientous teenage students, or slacking workers, and such like. Thanks! - Patty

Serving time, going through the motions, sleepwalking.

"good enough for government work"

Giving it a lick and a promise. Marking time.

Paying lip service. Swinging the lead.

in a trance. grinding. getting a "gentleman's C" showing up leaning on the shovel
payroll ghost (the last is based on the frequent "ghost payrollers" scandals we have in Chicago government) sliding by treading water

"riding the clock"
"the dog's body"