"the tower of Pisa is far out of plumb"
"clean forgot the appointment" "I'm plumb (or plum) tuckered out"
"fell plumb in the middle of the puddle"
The stairwell doesn't appear plumb, but tilted.
[He]..rolled down and plumbed into the yard.
牛津高階第八版
美國韋氏詞典
Dictionary.com
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維基百科 (自由的百科全書)