مَجَمٌّ

A place where water remains: or to which it reaches, and where it ends. (TA.)

(assumed tropical:) The breast, or bosom, or mind: (K, TA:) because it is the place in which are collected the knowledge &c. that it retains. (TA.) You say, هُوَ وَاسِعُ المَجَمِّ, i. e. رَحْبُ الذِّرَاعِ وَاسِعُ الصَّدْرِ (tropical:) [He is possessed of ample power and might, and free from distress of mind or from narrowness of mind]. (IAar, K, TA.) And إِنَّهُ لَضَيِّقُ المَجَمِّ (tropical:) Verily he is contracted, or straitened, in mind by affairs, or events. (IAar, TA.)