一下

(又作‘一下子’)

1. one time; once

♦ 亲~孩子的脸 give the baby a kiss on the cheek

♦ 拍~他的肩膀 give him a pat on the shoulder

2. in a short while; all at once; all of a sudden

♦ 灯~又亮了。 After a little while the lights went on again .

♦ 请等~。 Wait a minute, please.

♦ 这天气, ~冷, ~热。 Look at this weather. It's cold one moment and hot the next.