Magnetic compass : দিগদর্শন যন্ত্র;
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Appropriate Prepositions
Apply for(কারো কাছে আবেদন করা): Sumi applied to the Principal for free studentship.
Descend on (আক্রমণ করা): Armed thieves descended on the helpless girl.
Play at (খেলা): I do not play at cards.
Run over (চাপা পড়া): The man was run over by a truck.
Sick of (ক্লান্ত): He is sick of this idle life.
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Idioms
At a snail's pace (very slowly – খুব ধীর গতিতে) The economy of Bangladesh is growing at a snail’s pace.
At least (in the lowest estimate- কমপক্ষে) He is the owner of thirty lakh taka at least.
Do yeoman’s service (বিশেষ উপকার করা): Freedom fighters have done yeoman’s service for country.
In full swing (পুরোদমে): The school is in full swing after the vacation.
To the point (সঠিক) - The boy answered the question to the point.