Without provocation : অকারণ; অকারণে;
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Appropriate Prepositions
Abound with(ছেয়ে থাকা): They live in a region that abounds with oil.
Beg for(অনুরোধ করা): Maria begged the Superintendent for a seat in the school hostel.
Burst out a laughter(হাসিতে ফেটে পড়া) He bursts out a laughter.
Conceal from(লুকানো) Do not conceal anything from me.
Entitled to (অধিকারী): He is entitled to a reward for honesty.
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Idioms
At-fault (guilty-কিংকর্তব্যবিমূঢ়, অপরাধ, দোষ adj.) You are at fault.
Make hay while sun shines (ঝোপ বুঝে কোপ মারা) You should try to make hay while sun shines.
Pave the way (সুপ্রসন্ন করা) – I am sure I can pave the way for your success.
Red letter day (স্মরণীয় দিন): The 16th December is a red letter day for us.
Turn down (refuse, প্রত্যাখান করা) —He turned down my proposal.