To be tuckered out, or tired, is thought to derive from the image of a starved quadruped that’s so skinny and worn out that it has a “tucked” appearance just behind the ribs. It may have been influenced by an older verb tuck...
tuck-under n.— «Nadal has shown that his strategy can attract talent. (MDC also made four outright acquisitions, or “tuck-unders,” in Nadal parlance, this year.) What he’s selling—that talent matters above all, that the ad...