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English definition of “windowsill”

windowsill

noun [C]     /ˈwɪn.dəʊ.sɪl/ US  /-doʊ-/ (also window ledge)
a shelf below a window , either inside or outside a building : He's got a few plants in pots on the windowsill.Windows and parts of windows
(Definition of windowsill noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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