لحن1 لَحَنَ He erred in speech; spoke incorrectly. (Msb.) b2:  لَحَنَ لَهُ He said to him something which he (the latter) understood, but which was unintelligible to others: (Az, S, Msb, K:) he intimated to him something which he (the latter) alone understood.3 لَاحَنَهُمْ i. q. فَاطَنَهُمْ. (S, K.) See an ex. voce جَامِعٌ; and see my explanations of مُفَاطَنَةٌ.لَحْنٌ The meaning of speech; its intended sense or import: (S, K, TA:) its intent: (TA:) [it is direct: and also indirect:] an indication thereof whereby the person addressed is made to understand one's intent; so says Az (Msb: [and the like is said in the TA on the authority of AHeyth:]) an oblique, or ambiguous, mode of speech: (Msb:) an inclining of speech to obliqueness, or ambiguity, and equivocal allusion. (Bd, in xlvii. 32.) b2:  A barbarism, an incorrect word. b3:  عَرَفْتُهُ فِى لَحْنِ كَلَامِهِ and فى نَحْوِ كلامه. and فى مِعْرَاضِ كلامه signify the same. (Msb in art. عرض.) See the last of these voce عَرُوضٌ. b4:  لَحْنٌ A modulated sound; expl. as being مِنَ الأَصْوَاتِ المَصُوغَةِ المَوْضُوعَةِ: pl. أَلْحَانٌ and لُحُونٌ. (K.) You say, أَلْحَانُ الأَغَانِى [The modulated sounds of songs]. (Mgh.)