bedtime /ˈbɛdtaɪm/noun 1forms 1phrases 1 noun1 •The time or hour at which one retires to bed in order to sleep.I read every evening, sometimes late into the night, with the help of kerosene lamps, often secretly, past my bedtime. — 2004 formsbedtimes Phrases with bedtime tears before bedtimeHarm or damage that is incurred before a matter is concluded.