drag down
1. To physically move something from a higher location to a lower one. In this usage, a noun or pronoun can be used between "drag" and "down." Every day, the kids drag lots of toys down from their bedrooms, and every night, they whine about having to take them back upstairs.
2. To cause a decrease in the standard or quality of something. In this usage, a noun or pronoun can be used between "drag" and "down." It seems that all the construction in this part of town is dragging down our real estate prices.
3. slang To cause one to feel sad or demoralized. In this usage, a noun or pronoun can be used between "drag" and "down." Honestly, having to listen to you two fight all the time is really dragging me down.