old hand
noun [ C ] uk/ˌəʊld ˈhænd/ us/ˌoʊld ˈhænd/
老手，富有经验的人
someone who is very experienced and skilled in a particular area of activity
We should be able to trust Silva to negotiate a good deal for us - he's an old hand at the game. 们应能相信席尔瓦会为我们谈成一笔好生意——他精于此道。
Synonyms: old-timer veteran
Compare: warhorse