In passing : কথা প্রসঙ্গে; আলোচনা প্রসঙ্গে; আলোচনা বা কথা প্রসঙ্গ;
Related Words
imposing  in passing  infusing  invasions  See Words Also In
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Appropriate Prepositions
Acquit of (অব্যাহতি দেয়া): The chief justice acquitted him of the charge of murder.
Contrary to(বিপরীত, পরিপন্থী): Students should not act contrary to the rules of discipline.
Die from (কোন কিছু জন্য মারা যাওয়া): The poor person died from hunger.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
Sad at (দুঃখিত): All his colleagues were very sad at his transfer from this place.
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Idioms
Acid test (অগ্নি পরীক্ষা): You must succeed in the acid test of the time you live in.45
At random (indiscriminately—এলোপাথাড়ি-adv.) He talks at random like a mad man.
Birds of a feather (persons of like disposition-একই পর্যায়ের লোক) Bird’s of a feather flock together.
In the long run (পরিণামে): You will have to suffer in the long run.
Kith and kin (নিকট আত্মীয়): He has no relation with his kith and kin.