do sth in silence沉默地做某事
Do one in使力竭;杀死
do well in sth某方面做得好;在某方面做很好
do better in English在英语方面做得好
Do well in China中国好吗
do sth in hurry匆匆地做
do sth in detail详细做某事
Do still in school还在上学吗
do sb in翻译;杀死某人
PHRASAL VERB（动词词组） To do someone in means to kill them. 杀害 [非正式]
Whoever did him in removed a man who was brave as well as ruthless.
无论是谁杀了他，都是除掉了一个既大胆又无情的人。