Bit by bit : অল্পে অল্পে; খণ্ডে খণ্ডে; একটু একটু করিয়া; ধীরে ধীরে; অল্প অল্প করিয়া;
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Appropriate Prepositions
Adept in (দক্ষ): He is adept in playing football.
Annoyed at(ব্যক্তি ছাড়া অন্যকিছুর প্রতি বিরক্ত): They were annoyed at his rough behavior.
Burst out a laughter(হাসিতে ফেটে পড়া) He bursts out a laughter.
Detrimental to (অপকারী): Smoking is detrimental to health.
Faith in (বিশ্বাস): I have no faith in him.
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Idioms
Backstairs influence (secret and illegal influence- গোপন এবং বে আইনী প্রভাব-n) He did not deseve the job, however, he got it by backstairs influence.
In the wake of (ঠিক পরে): Police came in the wake of the accident.
Let loose (বল্গাহীনভাবে ছেড়ে দেয়া): He let his horse loose in the field.
On the wane (হ্রাসমান): His fame is on the wane now.
To the letter (in all details, অক্ষরে অক্ষরে) —Follow my advice to the letter.