Where does “downcoast” come from?

downcoast (English) comes from English coast, from Middle English coste, from Old French costé, from Latin costātus, from Latin costa, from Proto-Indo-European kost-.

downcoast (English): Downstream in the direction of coastal currents

Definitions

Downstream in the direction of coastal currents

Ancestry of “downcoast”, step by step

downcoast traces back through two separate lines of ancestry.

via English coast

Step	Language	Word	Meaning
1	English	coast	The edge of the land where it meets an ocean,...
2	Middle English	coste	—
3	Old French	costé	side
4	Latin	costātus	ribbed
5	Latin	costa	a rib; a side, a wall
6	Proto-Indo-European	kost-	—

via English Down

Step	Language	Word	Meaning
1	English	Down	usually known as County Down
2	Middle English	doun	down
3	Old English	dūn	hill, down; hill, dune; hill, mountain
4	Proto-Germanic	*dūnā	—
5	Proto-Celtic	dūnom	stronghold, rampart
6	Proto-Indo-European	dʰewh₂-	smoke; mist, haze

Every word from Proto-Indo-European kost- →