To do nothing useful
idle, trifle, lounge, kill time, be inactive, be unoccupied, be slothful, be indolent, vegetate, dally, take it easy, laze, twiddle the thumbs, not lift a finger, be lazy, loll, malinger, potter, drift, relax, slack, shirk, waste time, slow down, evade, dillydally, sit around, stand around, slack off, fritter time away, dream, let down, goof off*, bum*, goldbrick*, stall*, lollygag*, hand out*, hold up a corner*, piddle*; see also relax 1, rest 1.