Iron clad : লৌহকর্মদ্বারা সুরক্ষিত;
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Appropriate Prepositions
Bad at (অদক্ষ): He is not bad at English.
Defend against (রক্ষা করা): We will defend our country against all enemies.
Faith in (বিশ্বাস): I have no faith in him.
Hope for (আশা করা): Let us hope for the best.
Sick of (ক্লান্ত): He is sick of this idle life.
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Idioms
Crocodile tears (মায়াকান্না): He shed crocodile tears at our misery.
From cradle to grave (দোলনা থেকে কবর পর্যন্ত): Everyone has to learn from cradle to grave.
Lose heart (হতাশ হওয়া) — Do not lose heart in danger.
Maiden speech (প্রথম বক্তৃতা): His maiden speech fell flat on the audience.
Null and void (বাতিল): The deed has been null and void now.