To put on a face mask, especially for health protection or safety.
Put a mask on your face to protect yourself or others.
One main meaning — here's how to use it.
To put on a face mask as a public health measure or for safety protection.
"The sign at the hospital entrance told everyone to mask up before going inside."
Mask up. It's not about your rights, it's about protecting other people.
— Joe Biden, public address on COVID-19 safety guidelines, 2020
Became widely used during the COVID-19 pandemic (2020 onwards) as a public health instruction. Also used in industrial or hazardous work environments. Can be used as a direct command: 'Mask up!' The frequency of this phrase increased dramatically after 2020.
Natural word combinations native speakers use most often.
The five tense forms you'll use most often.
Listen to native speakers using "mask up" in real YouTube videos — click a clip to watch it on Looplines.
Swap in when you want variety — tap a linked one to explore it.
Jump to every phrasal verb built on the same verb, particle, or level.