Where does “afit” come from?

afit (Scots) comes from Scots fit, from Northern Middle English fut, from Old English fōt, from Proto-West Germanic fōt, from Proto-Germanic fōts, from Proto-Indo-European pṓds, from Proto-Indo-European póds, from Proto-Indo-European ped- — to walk, to step; to stumble, to fall.

afit (Scots): afoot, on foot

Definitions

afoot, on foot

Ancestry of “afit”, step by step

afit traces back through two separate lines of ancestry.

via Scots fit

Step	Language	Word	Meaning
1	Scots	fit	foot; lower end; to foot
2	Northern Middle English	fut	—
3	Old English	fōt	foot
4	Proto-West Germanic	fōt	foot
5	Proto-Germanic	fōts	foot
6	Proto-Indo-European	pṓds	foot
7	Proto-Indo-European	póds	foot
8	Proto-Indo-European	ped-	to walk, to step; to stumble, to fall

via Scots a

Step	Language	Word	Meaning
1	Scots	a	a, an; Alternative form of a'
2	Middle English	A	—
3	Middle English	I	I (first-person singular subject pronoun)
4	Old English	iċ	I
5	Proto-West Germanic	ik	I
6	Proto-Germanic	*ek	—
7	Proto-Indo-European	éǵh₂	I

Every word from Proto-Indo-European ped- →Every word from Proto-Indo-European póds →Every word from Proto-Indo-European pṓds →