What does "be short of" mean?
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Native speaker’s answer
Rebecca
To "be short of" something means to lack it, to not have enough. In this case, the speaker says "he won't be short of challenges at Twitter" to mean that at Twitter, there won't be a lack of challenges. Ex: I'm not short of clothes. I have too many clothes. Ex: I'm a little short of smiles recently. I feel sad.