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elbow grease

noun
🔊/ˈelbəʊ ɡriːs/
🔊/ˈelbəʊ ɡriːs/
[uncountable] (informal)
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  1. the effort used in physical work, especially in cleaning or polishing something (= rubbing it until it is smooth and shiny)苦干；（尤指费劲的）清洁，擦拭
    • Using the right tool can save a lot of elbow grease.使用正确的工具可以省去很多的力。