pair off
phrasal verb with pair verb [ I,T ] uk/peər/ us/per/
结成一对情侣;成双入对
to begin a romantic or sexual relationship with someone
All my friends seem to be pairing off and getting married. 我所有的朋友好像都已成双入对,正在准备婚事。
Ravens nest very early in the spring and they pair off in the late autumn. 渡鸦早春筑巢,晚秋交配。