summer time
noun🔊/ˈsʌmə taɪm/
🔊/ˈsʌmər taɪm/
(British English) (North American English daylight saving time)
[uncountable]the period during which in some countries the clocks are put forward one hour, so that it is light for an extra hour in the evening 夏令时（有些国家实行夏时制，将时钟拨快一小时，以节约照明能源）