Where does “crìochnaich” come from?

crìochnaich (Scottish Gaelic) comes from Old Irish críchnaigid, from Old Irish crích, from Proto-Celtic krīkʷā — furrow, trench, comb; furrow, trench, boundary.

crìochnaich (Scottish Gaelic): end, finish, stop, complete

Definitions

end, finish, stop, complete

Ancestry of “crìochnaich”, step by step

Step	Language	Word	Meaning
1	Old Irish	críchnaigid	fulfils, completes, ends
2	Old Irish	crích	boundary, limit, end; aim, purpose; confines,...
3	Proto-Celtic	krīkʷā	furrow, trench, comb; furrow, trench, boundary

Every word from Proto-Celtic krīkʷā →Every word from Old Irish crích →Every word from Old Irish críchnaigid →