1. To put, set, or lay someone or something underneath someone or something else. A noun or pronoun is used between "place" and "under." I placed the presents under the Christmas tree. I placed a pillow underneath my son so he would sleep more comfortably. Please place the patient under the light so I can see his injuries more clearly.

2. To direct, force, or take someone into some particular condition. A noun or pronoun is used between "place" and "under." They placed her under arrest for stealing car parts. The doctors said they wanted to place me under observation for a few days to make sure my body accepted the transplant.

3. To subject someone or something to some negative effect. A noun or pronoun is used between "place" and "under." The boss has been placing our team under an enormous amount of stress lately to get the project finished in time. The extra weight placed the safety strap under more strain than it could withstand.