pii-pii
A thin, high-pitched continuous sound — a whistle blowing, a baby chick peeping, or a kettle whistling. A sharp, persistent note.
💡A referee's whistle at a game — 'The whistle blew pii-pii to signal the end.'
笛がぴーぴー鳴っている。
The whistle is blowing pii-pii.
The baby chicks were ___ calling for their mother.
ひよこたちが母鳥を呼んで○○鳴いている。