vi.
哀伤，悲哀；痛心；惋惜(常与for， over连用)：
The manager announced his resignation and everybody mourned.
经理宣布了他的辞职，大家都感到惋惜。
凭吊，哀悼(常与for， over连用)：
He sat alone in his room after the battle, mourning over the loss of his best friend.
这场战役打完后，他独自坐在屋里，哀悼好友的牺牲。
戴孝，穿丧服，服丧
呜咽；哀鸣
vt.
为…悲痛；为…哀悼：
The whole nation mourned the death of the beloved premier.
全国哀悼敬爱的总理的逝世。
悲痛地发出(或说出)，发出(哀鸣)：
Let the whirlwind mourn its requiem.
任由旋风哀唱其挽歌。
为…感到痛心(或遗憾等)：
I really mourn the loss of that gold watch.
我真为失掉那块金表惋惜。