1To tell, inform, or announce something to someone — a transitive verb used when conveying news, results, or messages.
彼女は皆に結婚の報告を告げた。
She told everyone about her marriage.
警察は事件発生の事実を住民に告げた。
The police informed residents of the occurrence of the incident.
医師が検査結果を患者に告げる場面は慎重さが求められる。
The scene where a doctor tells a patient the test results requires caution.
2To indicate, signal, or mark something — to serve as a sign or to signal that something is happening.
教会の鐘が午後五時を告げた。
The church bell announced five o'clock.
鳥の異常な鳴き声が危険を告げているのかもしれない。
The birds' unusual cries might be signaling danger.
赤い空は嵐の到来を告げることがある。
A red sky can sometimes signal the coming of a storm.