Mourn \Mourn\ (m[=o]rn), v. i. [imp. & p. p. {Mourned} (m[=o]rnd); p. pr. & vb. n. {Mourning}.] [AS. murnan; akin to OS. mornian, OHG. mornen, Goth. ma['u]rnan.] 1. To express or to feel grief or sorrow; to grieve; to be sorrowful; to lament; to be in a state of grief or sadness. [1913 Webster] Abraham came to mourn for Sarah, and to weep for her. --Gen. xxiii. 2. [1913 Webster] 2. To wear the customary garb of a mourner. [1913 Webster] We mourn in black; why mourn we not in blood? --Shak. [1913 Webster] Grieve for an hour, perhaps, then mourn a year. --Pope. [1913 Webster]