noun
noun
1
A popular messaging app, launched in 2009 and later bought by Facebook, used for text, voice, and video communication.
"She sent the photos over WhatsApp."
verb
1
To message someone using WhatsApp.
"Just WhatsApp me when you land."
How to Use WhatsApp
Learner’s notesIn plain EnglishThe name of a major messaging app, also used casually as a verb meaning "to message via WhatsApp."
Word Forms
WhatsApped past tense, WhatsApps plural, WhatsApps singular
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She sent the photos over _____.
Etymology
A blend of the phrase "what's up" and the word "app," registered as a trademark for the messaging service.