The bulk update request #11116 is pending approval.

create implication muffled_speech (607) -> muffled (4280)
create implication muffled_screaming (293) -> muffled (4280)
create implication muffled_moaning (245) -> muffled (4280)
create implication muffled_sounds (25) -> muffled (4280)
create alias muffled_scream (44) -> muffled_screaming (293)

Reason: All these categories can be gathered under "muffled".