On the sly : গোপনে; গোপনে; চোরাগোপ্তাভাবে;
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Appropriate Prepositions
Abhorrence of (ঘৃণা): Everyone should have abhorrence of a par.
Attain to (লাভ করা): He will not attain to his objective so soon.
Catch at(ধরা): A drowning man catches at a straw.
Cope with(সামলানো বা পেরে উঠা): They cannot cope with the situation.
Substitute for (বদলে দেওয়া): This action is substitute for that.
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Idioms
At random (indiscriminately—এলোপাথাড়ি-adv.) He talks at random like a mad man.
Irony of fate (ভাগ্যের পরিহাস): He could not succeed by irony of fate.
Pave the way (সুপ্রসন্ন করা) – I am sure I can pave the way for your success.
Well up (সুপন্ডিত)- Dr. Shahidullah was well-up in Bengali language.
With the sweat of one’s brow (মাথার ঘাম পায়ে ফেলে) — He earns his livelihood with the sweat of his brow.