Concavo-convex : এক পার্শ্বে অবতল অন্য পার্শ্বে উত্তল;
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Appropriate Prepositions
Consent to(মত দেওয়া): My father did not consent to the proposal of my sister’s marriage.
Convince of(বিশ্বাস হওয়া): I am convinced of your efficiency.
Hunger for (আকাঙ্কা): The teacher has a great hunger for knowledge.
Look at (তাকানো): Students look at the blackboard.
Quick at (চটপটে): A cashier must be quick at figures.
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Idioms
At the latest (খুব বেশি দেরী হলে) He will arrive here at 5 p. m. at the latest.
Out of temper (ক্রুদ্ধ): The teacher is out temper to see the overall results.
See to (বিবেচনা করা)— Can you see to it that everyone gets a copy of this memo?
Take one to task (rebuke, তিরস্কার করা)— He took me to task for negligence of duty.
Turn a deaf ear to (pay no attention, প্রত্যাখান করা) —He turned a deaf ear to my proposal.