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Use "time-keeper" in a sentence
"They would make Q-Tip play time-keeper during Trivial Pursuit (we keep a strict 1 minute rule!), and then house him with the crates of fresh fifis in the cargo hold!"
"I think it starts at 50 bucks a minute, for now, but that only guarantees that the time-keeper is actually listening."
"Personally, i broke my watch a little while back, and have yet to replace it, because my phone has become my new time-keeper, so I haven't seen the need."