old hand

• Человек, который очень опытен, искусен или сведущ в каком-либо деле, особенно благодаря тому, что занимается им долгое время.

A person who is very experienced, skilled, or knowledgeable at doing something, especially due to having done it for a long time.

1. Experienced personB2informal

   A person who has a lot of experience in a particular activity or job.

   Опытный человек

   • He's an old hand at fixing cars; he can repair anything.
   • She's an old hand in the kitchen, so the meal was perfect.
   • Ask the old hand for advice; he knows all the tricks.