Meaning of dāng miàn:
dāng miàn
当面
Adverb
to sb's face; in sb's presence
Wǒ juédìng dāngmiàn gàosù tā zhēnxiàng.
我决定当面告诉他真相。
I decided to tell him the truth to his face.
Tā xǐhuān dāng miàn biǎodá zìjǐ de xiǎngfǎ.
她喜欢当面表达自己的想法。
She likes to express her thoughts in person.