前綴out一般不改變詞性，只改變單詞的意思，詞根加out前綴有兩類含義：一是表示「超過，過度」；二是表示「出去，過時」。一起來學習思維導圖列出的這些與前綴out相關的詞吧。
1.表示「超過，過度」
★outdo[at'du] v.勝過,戰勝(out+do做→做得超出別人)
He has outdone all his rivals in skil.
他在技巧方面勝過所有的對手。
She determined to outdo her brother at work and games.
她決心在工作和體育活動中勝過她的哥哥。
★outlive[at'lv] v.活得比……長(out+live活→超過別人活著)
He outlived his wife by three years.
比妻子多活了三年。
★outnumber [at'nmb(r)] v.在數量上超過(out+number數量)
They were completely outnumbered by the them.
在數量上我們完全被他們。
★outsize['atsaz] adj.過大的(out+size範圍→範圍超出)
They have gained outsize influence .
他們獲得了超大的影響力。
★outwear[at'we] v.穿破(out+wear穿→穿出了[洞])
Drops of water outwear the stone.
滴水穿石。
★outwit [atwt] v.以機智取勝(out+wit機智→機智超出別人)
Somehow he always manages to outwit his opponents.
他反正總能設法智勝對手。
★outbid[atbd] v.出價多於(他人)(out+bid出價→出價超出)
She outbid me for the vase.
那個花瓶她出價比我高。
★outlaw[atl:]n.歹徒(out+law法律→超越法律之人)
Jesse was an outlaw.傑西是個亡命之徒。
2.表示「出去，過時」
★outside adv.在外面(out+side旁邊→在外邊)
Their friends are waiting outside the door.
他們的朋友正在門外等著呢。
★outgoing[atg] adj.友善的；開朗的
(out+going走→走出來→心胸寬→待人友善的)
The girl is very outgoing.
這個女孩很外向。
My sister is more outgoing than me.我姐姐比我外向。
★outlandish [at'lnd]adj.奇異的
(out+land地+ish形容詞後綴→外地來的→奇異的)
They appeared at parties in outlandish clothes.
他們穿著奇裝異服參加各種聚會。
★outrage['atred] n.粗暴,暴行(out+rage怒氣→怒氣外露→粗暴)
It’s an outrage.這簡直太過分了。
The judge's remarks caused public outrage.
裁判的話引起了公憤。
★outskirts[atsk:ts] n.郊區(out+skirts裙子;城市周邊→郊區)
Hours later we reached the outskirts of New York.
我們幾小時後到達了紐約市郊。
★outflow [atfl] v.流出(out+flow流→流出)
Some people call it a talent outflow and consider it a great loss for our country.有人稱之為人才外流，並認為這是我國的重大損失。
★outbreak[atbrek] n./v.爆發(out+break斷裂→事情斷裂→爆發)
the outbreak of war戰爭的爆發
Outbreaks of rain are expected in the afternoon.
下午將有暴雨。
★outline[atlan] n.大綱;輪廓(out+line線條→劃出線條→大綱)
She drew the figures in outline .
她簡略地勾勒出人物的輪廓。
At last we could see the dim outline of an island.
我們終於能看到一小島朦朧的輪廓了。
★outmoded [atmdd] adj.過時的
(out+moded時髦的→出了時髦→不時髦的)
He still hugs his outmoded ideas.
他還死守著他那些過了時的觀念。