の前触れ

a sign of

→ の
phrase Rare #30,996
a sign of Attaches to a noun to describe something that signals or comes before it; it can also mean an omen or harbinger.
JA: この暖かい風は春の前触れです。
EN: This warm wind is a sign of spring.

もうひとつは死の前触れ…

The other one is an omen of death…

— RRR (2022)

ツバメは夏の前触れだ。

Swallows herald the arrival of summer.

じゃあ老化の前触れ

Then, it's an early sign of aging.

— フィールド・オブ・ドリームス (1989)

鶏の鳴き声は夜明けの前触れです。

The crowing of a rooster heralds the dawn.