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mask2 [transitive]
1 if a smell, taste, sound etc is masked by a stronger one, it cannot be noticed because of the stronger one : 
Liz turned on a radio to mask the noise.Air-fresheners mask bad smells instead of removing them.
Liz turned on a radio to mask the noise.Air-fresheners mask bad smells instead of removing them.2 to hide your feelings or the truth about a situation : Men often mask their true feelings with humour.
Men often mask their true feelings with humour.3 to cover or hide something so that it cannot be clearly seen : The new accommodation block has all but masked the original building.
The new accommodation block has all but masked the original building.
