I care about it; I insist
I care about it a lot.
C'est une bonne planche, j'y tiens.
It's a good board, and I'm attached to it.
— Apocalypse Now (1979)
Mais c'est à elle que je pense, parce que j'y tiens.
But she’s the one I’m thinking about, because I care about her.
— La grande bellezza (2013)
Je veux dire une chose, rapidement, j'y tiens.
I just want to say one thing quickly; it matters to me.
— Aquarius (2016)