Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
Vinegar in a dream is blessed money involving fatigue. Drinking it indicates enmity with family. Eating it with bread indicates contentment and blessing in life.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
Vinegar indicates long life and blessing in sustenance. It may also indicate a righteous man who benefits those around him.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
Vinegar is interpreted as wealth and benefit. Apple vinegar is better than grape vinegar and indicates lawful money.