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 grave

2 serious

3 severe

4 critical

1 painted eggshell

2 Easter egg

3 (media) Easter egg (hidden feature in software or a movie etc)

4 post-credits scene

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 variant: 蜑 Dàn

1 each word carries weight

2 a promise must be kept (idiom)

1 lit. not knowing what's important (idiom); no appreciation of the gravity of things

2 naive

3 doesn't know who's who

4 no sense of priorities

1 high merit and worthy prospects (idiom)

1 goose feather sent from afar, a slight present but weighty meaning (idiom); It's not the present the counts, it's the thought behind it.

1 goose feather sent from afar, a trifling present with a weighty thought behind it (idiom); It's not the gift that counts, but the thought behind it.