n 吼，啸;喧闹(轰鸣)声(loud，deep cry;sound or noise that continues for some time)[C][N(of)]：the～of a lion/an excited crowd/an engine/wind/waves/fire/applause/thunder/traffic 狮子的吼声/人们兴奋的喧闹声/发动机的轰鸣声/风的呼啸声/海浪的咆啸声/失火现场的嘈杂声/雷鸣般的掌声/隆隆的雷声/来往车辆的喧闹声;～s of laughter/anger/approval大笑声/愤怒的吼声/赞扬的喊声;set the table/the room in a～引得满桌子/屋的人哄堂大笑;the lion's/wounded animal's～s 那狮子/受伤野兽的吼叫声;a fierce/thunderous/confused/terrible/great～狂热的大喊声/雷鸣般的声音/嘈杂的喧闹声/可怕的声音/大声吼叫;an angry～ 怒吼;〖同〗cry，thunder，shout，roll，noise;

v (1)吼(喊，嚷)叫(give a loud，deep cry，to say or shout(sth)loudly)[I，I+prep，I+adv]：The crowd/tiger～ed fearsomely. 人群/老虎发出了可怕的吼声。～with laughter/rage/anger/pain 放声大笑/咆哮/怒吼/疼得大叫;～at sb 朝某人大声喊叫;～for mercy 大声求饶;～oneself hoarse 喊得声音嘶哑;a～ing tiger/fire/wind 怒吼的老虎/熊熊大火/狂风;〖同〗cry，shout;

(2)大声喊出(shout sth in a loud and deep voice)[T+n，T+n+adv(out)]：～one's approval/one's displeasure/one's command 大声表示同意/不满/发布命令;～out an order/a word of command/one's hunger 高声发布命令/高声发布命令/大声说饿了;“Come here!” He～ed.“过来!”他大声喊道。〖同〗cry，shout;

(3)呼啸，轰鸣(make a loud，deep sound or noise)[I]：The engine/storm/wind/sea is～ing. 发动机/风暴/狂风/大海在轰鸣(咆啸)。The cannons/thunder～ed. 炮声隆隆/雷声大作。〖同〗thunder;

(4)大笑(laugh loudly or a lot)[I]：～at the man's joke/the pantomime/the story 被那个人的笑话/哑剧/故事逗得大笑;The audience～ed when they saw the comic's antics. 看到那喜剧演员的滑稽动作时，观众放声大笑。

(5)发着轰鸣声驶(飞)过(make a loud deep sound while moving)[I+adv]：The lorry/plane～ed past/away. 汽车/飞机轰鸣着驶过/驶去。The train/bus～ed into the station/past us/down the hill. 火车/公共汽车轰鸣着驶进车站/从我们身边经过/朝山下驶去。He～ed away on his motorbike. 他骑着轰鸣的摩托车飞驰而去。

roar sb down 把某人哄下台去：The chairman attempted to call to the audience order，but was～ed down. 主持人想让听众安静下来，但被人们哄下台去。

→′roaring adj 怒吼的，咆哮的，轰鸣的，喧闹的;adv 极端地;

【辨异】roar与cry、shout、yell和scream的区别见CRY。