buttoned-up

== English == === Alternative forms === buttoned up === Adjective === buttoned-up (comparative more buttoned-up, superlative most buttoned-up) (figurative) Conservative. (figurative) Carefully planned and executed. Used other than figuratively or idiomatically: see button up. === References === “buttoned-up, adj.”, in OED Online ⁠, Oxford: Oxford University Press, launched 2000.