The term mudallas refers to concealment, and is often used in trade where defects in goods being sold are concealed.
A hadith that is mudallas is one which is weak (da'eef) due to the uncertainty caused by the concealment occurring in the narration process.
Typically this occurs where a reporter has concealed the identity of a narrator in some manner.
The famous scholar Ibn al-Salah describes two types of tadlis:
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