In theory : ধারণায়;
Related Words
in another way  in other words  in ter com  in tern  in the air  in the red  in the round  in the world  in theory  in turn  initiatory  inter  intercessory  interim  intermarry  intern  internally  interne  interns  interplay  inters  interse  See Words Also In
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Appropriate Prepositions
Authority over (কর্তৃত্ব, আধিপত্য): She has no authority over his growing daughters.
Call for(চাওয়া): I will call for his explanation.
Indispensable to (অত্যাবশ্যকীয়): Your help is indispensable to him.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
Urge upon (আহবান জানানো): She urged upon his son the importance of being honest.
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Idioms
Dead against (তীব্র বিরোধী - strongly opposed to): I am dead against corruption.
Fair play (প্রতারণা বিহীন নীতি বা কাজ): I believe in the practice of fair play in my business.
Fish in a troubled water (এলোমেলো অবস্থার সুযোগ নেয়া): He made a lot of money by fishing in a troubled water.
Pave the way (সুপ্রসন্ন করা) – I am sure I can pave the way for your success.
Slip of the pen (লেখায় অসতর্কতাবশত সামান্য ভুল): The mistake is due to a slip of the pen.