If it’s German, it’s weird. In German “Schluss” is an end. It has different connotations from the other word for end, “das Ende”, which is more literally “the

If it’s German, it’s weird. In German “Schluss” is an end. It has different connotations from the other word for end, “das Ende”, which is more literally “the end”: “Schluss” is something like “it’s over, pack it up!” Technically it does come from a declination of “schließen”, which mostly means “close”, so I assume that’s where the idea comes from, but in this form it does not reflect normal usage. “Lock” would be “abschließen”, but “Abschluss” as a substantive also rather means “the end of something”. As a free standing word it’s just… weird. If it’s Dutch maybe it makes sense, don’t know Dutch!