KanjiJLPT N1
Selection

washing, sieving, filtering, weeding out, luxury

Mnemonic

A storm tears through the orchard, shaking every tree violently. When it clears, only the plump, heavy fruits remain clinging to the branches — the weak, rotten ones were all blown away. This is nature's harsh selection, weeding out everything that can't hold on.
Additional thoughts
The storm acts as a natural filter: water and wind washing away the inferior, leaving only the plump survivors. This mirrors the kanji's sense of elimination through sorting, like panning for gold.
Quick recall
A storm blows away weak fruit, leaving only the plump ones — nature's brutal selection.

Details

The keyword for 汰 is selection. This kanji conveys the idea of sorting through things to separate the desirable from the undesirable, much like panning for gold by washing away impurities with water. It carries the nuance of weeding out or eliminating what is inferior through a process of careful selection. The character is most commonly encountered in the compound 淘汰, meaning natural selection or elimination.
On'yomi
た、たい
Kun'yomi
おご.る、にご.る、よな.げる