Literally, Sunnah refers to a way or habit. However, in Islamic terminology, it refers to the Sayings and Acts of the Holy Prophet  , including the times in which he remained silent, which is also referred to as Taqreer. Taqreer is included in Sunnah because it is the duty of a Prophet to speak and act if something haram/illegal is done in his presence. So, if Prophet Muhammad
, including the times in which he remained silent, which is also referred to as Taqreer. Taqreer is included in Sunnah because it is the duty of a Prophet to speak and act if something haram/illegal is done in his presence. So, if Prophet Muhammad  remained silent in some matters, it means that they were acceptable to him, and hence, to other Muslims as well.
 remained silent in some matters, it means that they were acceptable to him, and hence, to other Muslims as well.