劣汰
word- elimination of the weak (cf. 優勝劣汰|优胜劣汰[you1 sheng4 lie4 tai4])
Its characters
Words with it
Learn 劣汰 in real texts
With a free account, hover any word in the library for its meaning, hear it read aloud, save words for review timed to your memory, and see how much of each book you already know.