Phrase: happy as a clam; happy as a clam at high water

[W Brewer]

I used to tell my students to get a good night's sleep and wake up <<fresh
as a daisy>>. Until one particularly obnoxious EFL student kept challenging
me to explain why daisies should be considered so fresh. "Damn it, Jim, I'm
a DOCTOR, not a FLORIST!!!"

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