Lost labour : নিষ্ফল শ্রম; বেকার খাটনি;
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Appropriate Prepositions
Careful of (সতর্ক): He is very careful of his fault.
Catch at(ধরা): A drowning man catches at a straw.
Comply with(মেনে নেওয়া): The clerks must comply with the orders of their officer.
Conceal from(লুকানো) Do not conceal anything from me.
Guess at (অনুমান করা): It is difficult to guess at the age of women.
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Idioms
In vogue (চালু): This custom is not in vogue at present.
Look into something (তদন্ত করা- investigate) - The manager looked into the matter.
Pass sth/sb off as sth/sb (মিথ্যা পরিচয় দেয়া; Pretend – ভান করা): They were trying to pass off these shirts as genuine Armani.
Slip of the pen (লেখায় অসতর্কতাবশত সামান্য ভুল): The mistake is due to a slip of the pen.
With the sweat of one’s brow (মাথার ঘাম পায়ে ফেলে) — He earns his livelihood with the sweat of his brow.