[play possum] {v. phr.}, {informal}
1. To pretend to be asleep.
* /Johnny seemed to be fully asleep, but his mother knew that he was playing possum./
2. To stay quiet for self-protection; try to escape attention by inactivity.
* /The rabbit played possum under the bushes, hoping the hunter would not see him./* /Bob played possum when the teacher looked around./