Touch-and-go : বিপজ্জনক; অনিশ্চিত; ঝুঁকিপূর্ণ;
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Appropriate Prepositions
Adhere to (লেগে থাকা, অটল থাকা): You should adhere to your principal.
Appoint to(নিযুক্ত করা/হওয়া): Kibria has been appointed to the post of Headmaster.
Innocent of (নির্দোষ): The maid servant was proved innocent of the alleged theft.
Pity for (করুণা, সমব্যথা): I feel pity for this helpless old man.
Rule over (শাসন করা): In the absence of the Parliament, the President rules over the country.
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Idioms
At last (in the end – অবশেষে) He tried hard, and at last, succeeded in achieving his goal.
Dead against (তীব্র বিরোধী - strongly opposed to): I am dead against corruption.
From hand to mouth (দিন আনে দিন খায়): The poor man live from hand to mouth.
Hush money (ঘুষ): He offered a hush money to disclose the file.
Make hay while sun shines (ঝোপ বুঝে কোপ মারা) You should try to make hay while sun shines.