Mahabharata 3.13.109

इत्युक्त्वा प्रारुदत्कृष्णा मुखं प्रच्छाद्य पाणिनापद्मकोशप्रकाशेन मृदुना मृदुभाषिणी

ityuktvā prārudatkṛṣṇā mukhaṃ pracchādya pāṇināpadmakośaprakāśena mṛdunā mṛdubhāṣiṇī

Our plain-language meaning of this verse is waiting for scholar review.