(一般作 one's heyday)the period of a person's or thing's greatest success, popularity, activity, or vigour (人或物)最成功(受欢迎、活跃或有活力)的时期,鼎盛时期,黄金时期 the paper has lost millions of readers since its heyday in 1964. 这份报纸自1964年它的鼎盛时期以来读者少了几百万。
语源
late 16th cent. (denoting good spirits or passion): from archaic heyday!, an exclamation of joy, surprise, etc