a knockout competition

to discard; to eliminate

(literary) to eliminate; to delete

elimination of the weak (cf. 優勝劣汰|优胜劣汰[you1 sheng4 lie4 tai4])

(dialect) dirty; to mock sb

to wash away; to eradicate

to eliminate by examination

to cut back

(idiom) survival of the fittest

sacking the worst-performing employee; elimination of the worst-performing contestant

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