Through proper channel : যথাযথ প্রণালী-মাধ্যমে;
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Appropriate Prepositions
Aware of(অবগত): I am not aware of his dishonesty.
Cause for (চিন্তিত হওয়ার কারণ): He has never given me any cause for concern.
Defend against (রক্ষা করা): We will defend our country against all enemies.
Look after (দেখাশুনা): He looks after me.
Welcome to (স্বাগত জানানো): You are welcome to our new office.
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Idioms
Back and forth (to and fro-এদিক ওদিক – adv.) The mad man was walking back and forth in the doctor’s chamber.
Lame excuse (বাজে ওজর): The lame excuse will not do.
Square meal (পেট ভরা আহার): He is too poor to have a square meal everyday.
Sheet anchor (শেষ আশ্রয়; প্রধান অবলম্বন; আসল খুঁটি)— This small piece of land is his sheet anchor.
Wild goose chase (useless pursuit, পন্ডশ্রম) —Do not waste time in wild goose chase.