The meaning of "kill time" is:
The definition of "kill time" is:
(verb) to waste time by doing unimportant things
Instead of getting a job, the college student decided to kill time and just wait for school to start.
A: What did you do before the concert?
B: We just killed time at Starbucks.
A: What are you doing now?
B: I’m just killing time until my job starts.