Radar : যে বেতার যন্ত্রের সাহায্যে দূরবর্তী জাহাজ বা বিমানের অবস্থান ধরা পড়ে;
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radar  radiator  raider  reader  See Words Also In
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Appropriate Prepositions
Agree with, on, to(একমত হওয়া): My father agreed with me on this point, but he did not agree to my proposal to set up a canteen.
Annoyed with(ব্যক্তির সাথে বিরক্ত হওয়া): I am annoyed with him.
Assent to(সম্মতি দেওয়া): The President has assented to the bill.
Creep up (বৃদ্ধি পাওয়া): The prices of are creeping up day by day.
Derive from (উৎসারিত হওয়া): The one has been derived from the poem.
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Idioms
In lieu of (পরিবর্তে): Give me this pen in lieu of that.
In no time (শীঘ্র): He will finish the work in no time.
Make both ends meet (আয় ব্যয় মেলানো): I cannot make both ends meet with my small income.
Run a risk (ঝুকি নেয়া) — He ran a risk to save his life.
To and fro (hither and thither, এদিক ওদিক)-The man is walking to and fro.