1) Did a whole lot of nothing 2) Did naught 3) Did nothing 4) Did some whittling 5) Did very little 6) Dogged it 7) Frittered time away 8) Hung around 9) Hung out in the hammock 10) Injured and out of action 11) Just hung around 12) Just sat 13) Just sat around 14) Just sat there 15) Kept the engine running Found on https://www.crosswordclues.com/clue/idled