Concealing: Linguistically means to hide something. Terminologically, it means to pronounce a sakin non- stressed sound in between izhar and Idgham. This happens while maintaining the resonance in the first sound for two harakas. The sounds of concealing are: / sad /, / thal /,  / tha’ /, / j /, / sh / Q /, / s /, / k /, / dhad /,     / tha’ /, / z /, / t /, / d /, / ta’ / and / f /.