im-

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++im- /ɪm, ɪ/ prefix  NOTthe form used for in- before b, m, or p 不，无，非〔用于b,m或p前代替in-〕 immobilize 使不能动 impossible 不可能的

Examples from the Corpus

im-• to implodeIM /ˌaɪ ˈem/ noun [uncountable]  (instant messaging) a type of service available on the Internet that allows you to quickly exchange written messages with people that you know 〔因特网的〕即时通信From Longman Business DictionaryIMIM abbreviation for instant messaging

im- prefixIM nounChinese  

b, Corpus form before p for or used Business the m, in-

im-
im- /ɪm, ɪ/ prefix
the form used for in- before b, m, or p:
    immobilize
    impossible

im-BrE /ɪm/ 🔊NAmE /ɪm/ 🔊  ➡  in-