1 to wash out

2 elimination (by selection)

3 natural selection

4 to knock out (in a competition)

5 to die out

6 to phase out

1 to pan for gold

2 to try to make a fortune

1 to wash

2 to clean out

3 to cleanse

4 to eliminate

5 to dredge

1 Taobao Marketplace, a Chinese website for online shopping

1 naughty

2 mischievous

1 survival of the fittest (idiom)

1 out with the old and in with the new (idiom)