Etymology From Middle English mornen, mournen, from Old English murnan, from Proto-Germanic *murnaną. Cognate with French morne (“gloomy”).
1
Ambitransitive To express sadness or sorrow for; to grieve over (especially a death).
For two months, she mourned her father's passing.
She mourned the loss of her independence.
3 more examples
We mourn in black; why mourn we not in blood?1591 (date written), William Shakespeare, “The First Part of Henry the Sixt”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC, [Act I, scene i]:
Abraham came to mourn for Sarah, and to weep for her.1611, The Holy Bible, […] (King James Version), London: […] Robert Barker, […], →OCLC, Genesis 23:2:
Thane Krios: It seems there will be no one to mourn me when I die. You're the only friend I've made in ten years.2012, BioWare, Mass Effect 3 (Science Fiction), Redwood City: Electronic Arts, →OCLC, PC, scene: Nightmare:
2
Ambitransitive To engage in the social customs of mourning; to commemorate a death and/or honour the deceased socially.
In that society, a spouse is mourned for one year, a parent for six months.
Anone after ther cam balen / and whan he sawe kynge Arthur / he alyght of his hors / and cam to the kynge on foote / and salewed hym / by my hede saide Arthur ye be welcome / Sire ryght now cam rydynge this way a knyght makynge grete moorne / for what cause I can not telle1485, Sir Thomas Malory, “vij”, in Le Morte Darthur, book II:
2
A ring fitted upon the head of a lance to prevent wounding an adversary in tilting.