The term "dead soldier" typically refers to an empty or finished bottle of liquor, but there are numerous synonyms that can be used as well. Some common synonyms for "dead soldier" include "empty," "bottle," "finished," "drained," "exhausted," "spent," and "depleted." Additionally, some people may use more creative or humorous terms, such as "booze tombstone," "hollow log," or "alcohol casualty." No matter which term is used, the underlying meaning remains the same - the bottle is empty and the alcohol inside has been consumed.