A direct call for deep mourning and loud weeping is directed at Egypt in anticipation of a severe disaster. The prophet urges the nation to raise their voices in a bitter wail, expressing their agony through sharp cries of woe and deep distress [רש״י, רד״ק, מצודת ציון, מצודת דוד, ביאור שטיינזלץ].
This intense outpouring of grief is focused on an approaching time of punishment. It is a day of disaster specifically targeting those who worship idols, a theme that unfolds as the prophecy continues [רש״י, מצודת דוד, ביאור שטיינזלץ]. While Egypt has endured periods of ruin and collapse throughout its history, this specific lamentation points to something far worse. It marks the ultimate, final day of reckoning, a time when the nation will face complete and total destruction [מלבי״ם].