vi.

1. 协调，和谐[（+with）]
   The colors of your coat, hat and muffler should harmonize.

   你外套、帽子和围巾的色彩应该协调。

2. 以和声唱（或演奏）

vt.

1. 使协调；使和谐
2. 以和声唱（或演奏）
   The singing teacher taught them to harmonize the new song.

   声乐老师教他们用和声唱那首新歌。

v.

1. provide harmony for.
   ▸sing or play in harmony.
2. make or be harmonious or in agreement.
   ▸make consistent:

   plans to harmonize the railways of Europe.