Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
The arm in a dream is the brother or friend relied upon. Its strength is the brother's strength, and its cutting off is his separation.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
The arm indicates striving and work. Whoever sees his arm is long is generous.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
The arm is interpreted as a partner in work. Whoever sees his arm break will separate from his partner.