This is the 11436th most frequent Korean word.
꺾은
"꺾은" means "bent" or "broken" (past tense of 꺾다: to bend or break).
The word "꺾은" is used here as a past participle that describes the flowers as having been picked (or broken off) from somewhere.
그는 길에서 꺾은 꽃을 집으로 가져왔다.
He brought flowers that he picked from the road to his house.
Here, "꺾은" characterizes the opponent as the one who broke or ended the winning streak.
축구 경기에서 팀은 연승 기록을 꺾은 상대를 만났다.
In the soccer match, the team faced an opponent that broke their winning streak.
In this sentence, "꺾은" describes the thumb as bent, giving it a state or characteristic.