preserving in alcohol; alcohol-preserved
Literal use: food or specimens preserved in alcohol. Often used as a noun or with の to modify another noun.
These fruits are preserved in alcohol.
Alcohol-preserved specimens are lined up in the lab.
heavy drinking; pickling one's liver; being a souse
Figurative, colloquial: describes a person who drinks heavily or a lifestyle soaked in alcohol. Often used humorously or critically.
He's pickled in alcohol every night.
A life soaked in alcohol like that is bad for your health.