Without provocation : অকারণ; অকারণে;
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Appropriate Prepositions
Abstain from(বিরত থাকা): I am trying to abstain from sweets for my new diet.
Adhere to (লেগে থাকা, অটল থাকা): You should adhere to your principal.
Convict of(দোষী সাব্যস্ত হওয়া): The accused person was convicted of the murder.
Hanker after (আকাঙ্ক্ষা/লোভ করা): He hankers after riches.
Refrain from (বিরত রাখা বা থাকা): I refrained him from smoking.
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Idioms
Bad blood - (শত্রুতা): There has always been bad blood between these families.
Milk and honey – (প্রাচুর্য)- He lives with milk and honey.
Salt of the earth (গুরুত্বপূর্ণ ব্যক্তিবর্গ) —The salt of the earth is remembered always.
Weal and woe (সুখ-দুঃখ): Human life is full of weal and woe.
Worthy of (যোগ্য) - He is worthy of a good job.