de son plein gré

of his/her own free will

→ de
phrase Uncommon #22,703
of his/her own free will The possessive changes to match the person: de leur plein gré means “of their own free will.”
FR: Elle a accepté de son plein gré.
EN: She agreed of her own free will.

Il l'a fait de son plein gré.

He did it of his own free will.

Adriano a embrassé Rima de son plein gré.

Adriano kissed Rima of his own free will.

Cedric est mort de son plein gré ?

Did Cedric die of his own free will?

— Harry Potter et l'Ordre du Phénix (2007)

Et de son plein gré, j'entends bien.

And of his own free will, I mean.

Elle fit la vaisselle de son plein gré.

She did the dishes of her own free will.

De son plein gré ?

Of his own free will?

— Psychose (1960)

Chen Nian est venu de son plein gré ici.

Chen Nian came here of his own free will.

— Better Days (2019)