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From LSJ

Ἡ γλῶσσ' ἁμαρτάνουσα τἀληθῆ λέγει → Inesse linquae veritas lapsae solet → Die Zunge, wenn sie in die Irre geht, spricht wahr

Menander, Monostichoi, 228

French (Bailly abrégé)

dat. sg. masc. et neutre de οὗτος.

English (Strong)

dative case singular masculine or neuter of οὗτος; to (in, with or by) this (person or thing): here(-by, -in), him, one, the same, there(-in), this.

Russian (Dvoretsky)

τούτῳ: dat. к οὗτος и τοῦτο.