תהילים לה:יד פירוש: רש״י

I walked about as though it were a friend or as though it were my own brother As though it were my brother or my friend; I walked about depressed because of their distress.

as the mourning of a mother As a son who mourns for his mother or as a mother who mourns for her son.

with gloom Heb. קדר, an expression of blackness.