1 to add oil

2 to top up with gas

3 to refuel

4 to accelerate

5 to step on the gas

6 (fig.) to make an extra effort

7 to cheer sb on

1 oil

2 fat

3 grease

4 petroleum

5 to apply tung oil, paint or varnish

6 oily

7 greasy

8 glib

9 cunning

1 Qing or Ch'ing dynasty of imperial China (1644-1911)

2 surname Qing

1 Qingxin county in Qingyuan 清远, Guangdong

1 clear

2 distinct

3 to understand thoroughly

4 to be clear about

1 to be very clear about sth (idiom)

1 perfectly clean

2 blameless

3 unimpeachable (idiom)

1 lit. as clear as water (idiom)

2 fig. (of officials etc) honest and incorruptible

1 lit. both sleeves flowing in the breeze (idiom); having clean hands

2 uncorrupted

3 unsoiled by corrupt practices

1 clear as ice and clean as jade (idiom); spotless

2 irreproachable

3 incorruptible