noun
group wrecker; circle crusher
Slang term for a person who disrupts a social circle, especially by causing romantic conflicts or jealousy among members. Often used in university club or online community contexts.
wasei-eigo (Japanese-coined English), from circle crusher
彼がサークルクラッシャーになって、みんなの仲が悪くなった。
He became a group wrecker and everyone's relationships turned sour.
サークルクラッシャーが現れると、楽しい集まりも台無しになる。
When a circle crusher shows up, even a fun gathering gets ruined.