- deeply engaged in conversation.
- engaged columns.
- her line is busy.
- intermeshed twin rotors.
- kept getting a busy signal.
- meshed gears.
- receptionists' telephones are always engaged.
- she keeps herself fully occupied with volunteer activities.
- the carpenter engaged (or employed) for the job is sick.
- the desperately engaged ships continued the fight.
- the gears are engaged.
- the lavatory is in use.