lower²

vi.

1. （天空等）變得陰沉
   As the sky was lowering, the mother asked her child to come home.

   當天空逐漸陰沉時，這位母親叫她的孩子回家。

2. 皺眉頭，現出愁容[（+at/on/upon）]
   They lowered at each other without saying anything.

   他倆無言以待地互皺眉頭。