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break·through
ˈbrāk-ˌthrü
plural breakthroughs
2
b
: an instance of passing through a barrier or protection
specifically, medical
: infection occurring in someone who is fully vaccinated against an infectious agent
A vaccine breakthrough occurs when a person tests positive for COVID-19 two weeks after being fully vaccinated against the disease … —
David Rasbach
—often used before another noun Two other CDC studies of breakthrough cases at nursing homes showed the vaccines protected residents, even when the virus spread through the homes. —
Maura Dolan … the academy recently recommended that children receive two doses of the chicken pox vaccine, rather than just one, because the additional dose bolsters immunity and may help reduce breakthrough infection. —
Maria Raven
broke through; broken through; breaking through; breaks through
: to make a breakthrough
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Merriam-Webster unabridged
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- Often used to describe “the march of time,” what does inexorable mean?


Can you make 12 words with 7 letters?
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