動詞 mourn:

1. feel sadness
2. observe the customs of mourning after the death of a loved one

1. People wore crapes to mourn our leader.
   人們戴著黑紗哀悼我們的領導。
2. The old woman still mourns for her son.
   這位老太太還在為兒子的死傷心。

mourn

v.（動詞）
mourned,mourn.ing,mourns
v.intr.（不及物動詞）
To feel or express grief or sorrow.See Synonyms at grieve
悲痛：感到或表示悲傷或悲痛參見 grieve
To show grief for a death by conventional signs, as by wearing black clothes.
服喪：對死者表示哀悼而戴上傳統(tǒng)標記，如別一塊黑布等
To make a low, indistinct, mournful sound. Used especially of a dove.
咕噥：發(fā)出低低的、不清晰的、痛苦的聲音，尤指野鴿子咕咕低鳴
v.tr.（及物動詞）
To feel or express deep regret for:
感到或表示深深的遺憾：
例句：
mourned the wasted years.
懊悔虛度的年華

To grieve over (someone who has died).
哀悼：對死者表示哀悼
To utter sorrowfully.
悲哀地說

來源：
Middle English mournen
中古英語 mournen
from Old English murnan * see (s)mer-
源自 古英語 murnan *參見 (s)mer-

【引伸】
mourn.er
n.（名詞）
mourn.ingly
adv.（副詞）