Where does “lockstep” come from?

I notice there's an issue with the etymology chain provided: it shows "Old English loc" and "Old English steppan" as separate entries, but then lists "Proto-Indo-European lewg-" three times without clear progression or connection between them. The chain appears incomplete or corrupted. "Loc" doesn't clearly connect to "steppan," and neither obviously derives from "lewg-" (which typically relates to bending/breaking, not stepping or locking). Could you verify the chain? A proper etymology for "lockstep" would need: - How "lock" (Old English or earlier) connects to its root - How "step" (from steppan) connects to its root - Clear intermediate languages bridging Old English to Proto-Indo-European Without a coherent chain, I cannot write an accurate sentence that "states only what the chain supports."

lockstep (English): A step whereby the toe of one man is brought very...

Definitions

  1. A step whereby the toe of one man is brought very...

Ancestry of “lockstep”, step by step

lockstep traces back through two separate lines of ancestry.

via English step

StepLanguageWordMeaning
1EnglishstepAn advance or movement made from one foot to the...
2EnglishstepchildThe child of one's spouse but not one's own; A...
3Middle Englishstepchildstepchild child of a spouse
4Old Englishstēopċildstepchild
5Old Englishċildchild, youth; fetus; female baby; child
6Proto-Germanickelþazfetus; newborn; infant; child
7Proto-Indo-Europeanǵelt-womb
8Proto-Indo-Europeanǵel-to swallow; swallow

via English Lock

StepLanguageWordMeaning
1EnglishLockfrom the surname
2Middle Englishloklock
3Old Englishlācplay, sport, strife, battle, sacrifice, offering,...
4Proto-West Germaniclaikgame, sport
5Proto-Germaniclaikazdance; game, sport; hymn
6Proto-Indo-Europeanleyǵ-to bind, tie
Every word from Proto-Indo-European ǵel-