this very thing; this precisely
Emphatic expression combining これ (this) with the particle こそ, which singles out the preceding word as exactly the thing being emphasized. Often used to highlight that something is the ideal or definitive example.
See also: こそ
This is exactly the book I was looking for.
This is truly authentic Japanese cuisine.
Compound of これ (this) and the emphatic particle こそ. The particle こそ has been used since Old Japanese to single out and emphasize a preceding element.