I am interested in knowing the shari’ definition of laghw (vain talk) and a practical exa

Walaikum assalam wa rahmatullah,

In al-Mughrib, one of the foremost works on the fiqhi language and usage, Imam Mutarrizi defined laghw as being, ‘false speech.’ It includes oaths one says without intending them. (Highly blameworthy.)

Ala’ al-Din al-Bukhari explained laghw as being, ‘that which one utters without intending it.’ [Kashf al-Asrar `ala Usul al-Bazdawi]

Laghw is normally mentioned in the context of vain oaths—those which one uttered in speech without intending to make an oath or vow.

And Allah alone gives success. 

Faraz Rabbani