Where does “alert” come from?

Alert comes from French alerte, from the phrase à l'erte combining French à, Latin ad, and Latin erte, ultimately derived from Latin ab.

alert (English): Attentive; awake; on guard; brisk; nimble; moving...

Definitions

  1. Attentive; awake; on guard; brisk; nimble; moving...

Ancestry of “alert”, step by step

StepLanguageWordMeaning
1Frenchalertealert; agile; first-person singular present...
2Italianall'ertaAlternative spelling of allerta; to the height
3Italianertafeminine singular of erto; steep slope
4Italianertosteep
5Latinērectuserected, made upright, raised, having been set up
6Latinērigōto raise up, elevate, lift
7Latinregōto rule, govern, direct
8Proto-Italicregō
9Proto-Indo-Europeanh₃réǵetito be straightening, to be setting upright
10Proto-Indo-Europeanh₃reǵ-to straighten, to right oneself; right; just
Every word from Proto-Indo-European h₃reǵ-Every word from Proto-Indo-European h₃réǵetiEvery word from Proto-Italic regō
alert — Etymology, Origin & Word History | Etymology Explorer