ل ح نl-ḥ-n
(ف) لَحَنَ يَلْحَنُ لَحْنًاlaḥana yalḥanu laḥnan: to turn speech away from its apparent sense and say it by allusion; from this comes "لَحْنlaḥn", i.e. the manner of speech by which the intent is understood. An error in case-inflection is also called لَحْنlaḥn, because it turns speech away from its proper course. Only once in the Quran: ﴿وَلَتَعْرِفَنَّهُمْ فِيْ لَحْنِ الْقَوْلِ﴾ (Muḥammad 47:30) — i.e. you will recognise them by their manner of speech.