Idgham-e-Taam (Complete assimilation of letters)
When Nun saakin نْ appears at the end of a word and the first letter in the next word is either letter ل or ر having ّ then there will be a slight alteration in pronunciation - In such case the letter with nun saakin نْ is fully assimilated (without nasal sound) In another words, the sound of Nun saakin نْ will disappear completely.

Urdu

French