Where does “การเฝ้า” come from?

การเฝ้า (Thai) comes from Thai การ, from Pali kāra, from Sanskrit कार, from Sanskrit कृ, from Proto-Indo-European kʷer- — to do; to make; to build.

Ancestry of “การเฝ้า”, step by step

การเฝ้า traces back through two separate lines of ancestry.

via Thai การ

StepLanguageWordMeaning
1Thaiการwork; matter; task; affair; prefixed to nouns to...
2Palikāradeed; doing, manner; production, application
3Sanskritकारgain, prize, booty; contest, war; an act, action
4Sanskritकृto make
5Proto-Indo-Europeankʷer-to do; to make; to build

via Thai เฝ้า

StepLanguageWordMeaning
1Thaiเฝ้าto have an audience (with), to meet, to see, to present oneself (before), to enter the presence (of), to wait (on), to attend, to tend, or to serve (a god, high priest, royal person, person in authority, etc)
Every word from Proto-Indo-European kʷer-Every word from Sanskrit कृEvery word from Sanskrit कार