Meanings
present singular third person masks up · participle present masking up · participle past masked up · past masked up
- intransitiveTo put on a mask, especially a safety mask or a medical face mask.
2 more examples
Soldiers are trained to immediately mask up at the first sign or suspicion that a chemical attack is in progress and then immediately give the signals themselves. In conjunction with any early warning of chemical attack, the donning of the protective mask will provide the best possible protection that the foot soldier has against airborne chemical agent attack.
2001, Eric R. Taylor, Lethal Mists: An Introduction to the Natural and Military Sciences of Chemical, Biological Warfare and Terrorism, Huntington, NY: Nova Science Publishers, →ISBN, page 181Winston arrived twenty-four hours ago. Before I can enter the ward where he lies, I need to mask up. In theory, the masks we all wear – paper thin, though reinforced with a water-resistant coating – will prevent the virus from contaminating our mouth or nose, even when a patient coughs in our direction.
2021, Rachel Clarke, Breathtaking: Inside the NHS in a Time of Pandemic, London: Little, Brown, →ISBN, page unknownSynonyms: mask
Synonyms & antonyms
verbTo put on a mask, especially a safety mask or a medical face mask.
Origin
Popularized in 2020 during the COVID-19 pandemic. Before that, attested but not common outside technical contexts.
Full word history & related roots →Cite this entry
mask up. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/mask%20up
“mask up.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/mask%20up. Accessed November 4, 2026.
WatkinsX Dictionary, s.v. “mask up,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/mask%20up.
Source: mask up on Wiktionary, CC BY-SA 4.0.