1. To set someone or something at a position directly to the rear of someone or something else. In this usage, a noun or pronoun is used between "place" and "behind." You can just place the mirror behind the sofa for the time being—we're still not sure where we're going to hang it. The teacher placed me behind the others for the choir performance because I was so much taller than them.

2. By extension, to value on someone or something to a lesser degree, or to regard someone or something less highly or favorably, than someone or something else. In this usage, a noun or pronoun is used between "place" and "behind." You really shouldn't place the needs of your family behind the needs of your family. I always felt like Mom placed Tommy and I behind our baby brother when we were growing up.

3. By extension, to achieve a rank that is lower someone or something in a contest or competition. He was favored to win the whole tournament, but he ended up placing behind the sixth seed. Sarah and I have been rivals in tennis for years, but I keep placing behind her in recent competitions.