The poem describes a childhood memory of the speaker feeling extremely ill during a long car trip as a young child. While lying in the backseat feeling like her insides were splitting open, she asked her mother how she would know if she was going to die. Her mother confidently answered that she would know if she was unable to make a fist with her hand anymore. Though very ill, the speaker did not die and is still alive today. The memory reminds her of the personal borders and struggles we each must face alone in life, represented by her small fist opening and clenching in the backseat behind her many questions.