As a door turns on its hinges, so a sluggard turns on his bed.
NMV[As] the door turns upon his hinges, so [does] the slothful upon his bed.
OJBAs the delet (door) turneth upon its hinges, so doth the atzel (sluggard, lazy one) upon his mittah (bed).
T4TA door continually swings back and forth on its hinges and does not go anywhere; similarly [SIM], lazy people just continually turn over in their beds and never do anything.