Favorite German Words
Der Lückenbüßer (masc.) / Die Lückenbüßerin (fem.) = the stopgap, the makeweight, the fill-in, the in-between. A person who is being used for the „time between“ 2 things, as a temporary fill-in.
Mostly applies to work situations or in human relationships, without the person realizing it. It‘s your friend who is being played and you see it but they don‘t.
Or that guy at work who‘s just being used as a temporary fill-in until the company can find someone else for the position — without him realizing it.