Definition of I can't tell you
informal
—used to emphasize a statement I can't tell you how pleased we are that you could join us.
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“I can't tell you.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/I%20can%27t%20tell%20you. Accessed 20 May. 2022.
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