1. To exchange places, roles, or activities. I don't mind driving first—we can swap over once we're about halfway there. Well, originally I was in charge of marketing and Keith was in charge of sales, but we swapped over last fall.
2. To change or revert to an alternative thing or system. He said we should swap over to gas heating because it's more efficient than electric. I have to swap the sound system over to a different power source. Thankfully the airline swapped us over to an earlier flight at no extra cost.
1. To exchange a part with some similar part: She swapped the flashlight's batteries over to see if the bulb had burned out. He swapped over the memory card for a new one.
2. Chiefly British To exchange positions or functions: When we reach London, let's swap over; you drive and I'll read the map.