1600, in the meaning defined above
Time Traveler for who'll
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From the Editors at Merriam-Webster
A Who’s Who Regarding ‘Who’s’...
Whose line is it? Well, who's asking?
Cite this Entry
“Who'll.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/who%27ll. Accessed 29 Jun. 2022.
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