初はつ声こえ

noun

first animal sound of the year; first seasonal animal sound

Rare term for the first vocalization of an animal in the new year or a new season, such as the first cry of a bush warbler in spring.

• 俳はい句くでは、鶯うぐいすの初はつ声こえを春はるの訪おとずれとして詠よむことがある。

  In haiku, the first song of the bush warbler is sometimes composed as a sign of spring's arrival.