oldhand
nounUK /ˌəʊld ˈhænd/
US /ˌoʊld ˈhænd/
An old hand is someone who has done a job for a long time and knows it very well.
She's an old hand at baking bread, so she never needs a recipe.
RELATED WORDS
OTHER MEANINGS
2. A person who has been a member of a group or place for a long time.
The old hands at the club showed the new members around.
3. Someone who is very skilled at a particular activity because of years of doing it.
He's an old hand at fixing cars and can spot a problem in seconds.
4. A seasoned sailor or worker with long experience at sea or on a job.
The captain trusted the old hands to handle the ship in the storm.