Effective force : ত্বরণ-বল;
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Appropriate Prepositions
Absorbed in(মগ্ন): I am absorbed in my study.
Acquit of (অব্যাহতি দেয়া): The chief justice acquitted him of the charge of murder.
Argue with, about(কথা কাটাকাটি করা): They always argue with me about tiny matter.
Attacked with(আক্রান্ত): He is attacked with …
Look over (পরীক্ষা করা): He was looking over the answer scripts.
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Idioms
At home (comfortable— আরাম) He feels at home in Dhaka now.
Gain Ground (সুবিধা পাওয়া): The wise are said to gain the ground in the long run.
Hue and cry (শোরগোল): The villagers raised a hue and cry to see the thief.
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.