occupied (in)engaged ininvolved inemployed inworking atlaboring attoiling atslaving athard at work (on)wrapped up (in/with)rushed off one's feet (with)hard-pressedtime-poorat work (on)on the jobabsorbed inengrossed inimmersed inpreoccupied withactive (in)livelyindustriousbustlingenergetictirelesshave one's hands fullinformal：busy as a beeon the gohard at iton the hop
