parole contre la sienne

my word against his/hers/theirs

→ parole
phrase Rare #43,998
my word against his/hers/theirs Used when one person’s statement is being directly compared with another person’s statement, especially in a disagreement or legal context. La sienne agrees with the person being referred to and can mean his, hers, or theirs depending on context.
FR: C'est ma parole contre la sienne.
EN: It's my word against his/hers/theirs.

C'est ma parole contre la sienne.

It's my word against his.

C'est ta parole contre la sienne.

It's your word against his.

C'est votre parole contre la sienne.

It's your word against his.

C'était ma parole contre la sienne.

It was my word against his.

— Harry Potter et la Chambre des secrets (2002)