(of a cosmetic) reduce the shine or oiliness of (the complexion).
Example sentencesExamples
And if you still get midday shine, mattify it by dabbing on a weightless powder that won't leave skin caked.
If that isn't enough, you could always try mattifying moisturisers.
Of course, you'll probably need to try a few out to find the best one for your skin but, as a general rule, pick alcohol-free formulations for dry skin and pick mattifying or shine-control toners for oily skin.
‘If you're only oily in the T-zone, try using a mattifying lotion under your makeup in the oily areas,’ suggests Michael.
If you need extra oil control, she suggests using a mattifying lotion underneath your sunscreen and makeup.