Breakthrough : শত্রুবূহ্যভেদ; বিরাট সাফল্য-অর্জন;
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break through  breaks through  breakthrough  breakthroughs  See Words Also In
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Appropriate Prepositions
Caution against(সাবধান): Take all cautions against the danger.
Contribution to (অবদান): His invention made a major contribution to road safety.
Cope with (এঁটে ওঠা; তাল মিলিয়ে চলা): They cannot cope with so much work.
Free from (মুক্ত): He is now free from danger.
Sick of (ক্লান্ত): He is sick of this idle life.
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Idioms
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
In a fix (মুশকিলে পতিত হওয়া): The man is in a fix with his new hairstyle.
On the wane (হ্রাসমান): His fame is on the wane now.
Run into debt (ঋণগ্রস্ত হওয়া)— He ran into debt.
Swan-song (অন্তিম গীত, শেষ কর্ম): This writing is the swan song of Kazi Nazrul islam.