紅こう一いっ点てん

noun

the lone woman in a group

Idiom literally meaning 'a single point of red', referring to the only woman among men, often with a nuance of standing out like a bright flower.

• 会かい議ぎ室しつには男だん性せいばかりで、彼かの女じょが紅こう一いっ点てんだった。