A mate, companion, or associate.
A companion in battle; fellow soldier.
A fellow socialist, communist or other similarly politically aligned person.
A non-hierarchical title, functionally similar to "Mr.", "Mrs.", "Miss", "Ms." etc, in a communist or socialist state.
To associate with in a friendly way.
A friend or mate
A person who maintains railway lines.
Someone who fiddles or tinkers with things.
An ostler; one who looks after the horses in a mine.
Someone whose job is to sand and grind small imperfections from metal and ceramic castings.