المعنى الاصطلاحي :

The torment inflicted by Allah on the disbelievers and Muslim sinners after their death temporarily or perpetually until the Day of Judgment.

الشرح المختصر :

Believing in "‘adhāb al-qabr" (the torment of the grave) is part of belief in the unseen and the Last Day. It is a truth that Ahl-us-Sunnah wa al-Jamā‘ah believe in, which is inflicted on both the soul and the body. Human life is divided into three parts: First: the worldly life, which ends in death. Second: life in the Barzakh (isthmus), which starts after death and ends when the Hour comes, whether or not the deceased was buried in a grave. It is either a life of bliss or of torment and hell. Third: life in the Hereafter, which starts when people are resurrected from their graves. "‘Adhāb al-qabr" is either perpetual or temporary. The disbelievers and hypocrites experience torment perpetually, while the Muslim sinners are tormented according to their sins. Torment means a painful punishment, and it is of two types: physical and mental. Physical torment has many forms, such as beating with iron hammers, tearing the sides of the mouth, stoning the head, sitting on fire and getting clad in fire, etc. Mental torment involves deep regret and remorse, humiliation, fright, etc.