Where does “ความล่มจม” come from?

ความล่มจม (Thai) comes from Thai ล่มจม, from Thai ลม, from Proto-Tai *C̬.lɯmᴬ — wind.

Ancestry of “ความล่มจม”, step by step

ความล่มจม traces back through two separate lines of ancestry.

via Thai ล่มจม

StepLanguageWordMeaning
1Thaiล่มจมto go to or undergo destruction, disaster, or downfall
2Thaiลมwind; breeze; air; intestinal gas
3Proto-Tai*C̬.lɯmᴬwind

via Thai ความ

StepLanguageWordMeaning
1Thaiความaffair; matter; content; essence; subject;...
2Proto-Taiɣwaːmᴬmatter
Every word from Proto-Tai *C̬.lɯmᴬ →Every word from Thai ลม →Every word from Thai ล่มจม →