have/keep/put one's finger on the pulse of
have/keep (something) up one's sleeve
“Have/keep (something) up one's sleeve.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/have%2Fkeep%20%28something%29%20up%20one%27s%20sleeve. Accessed 9 Dec. 2022.
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