Catalyst : অনুঘটক;
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catalectic  catalyst  catalysts  See Words Also In
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Appropriate Prepositions
Alarm at, by, for(আশংকা করা/শঙ্কিত হওয়া): I was not alarmed at/by the news, but I was alarmed for their safety.
Count upon(নির্ভর করা): He always counts upon your help for this work.
Desire for (কামনা): He has no desire for fame.
Hunger for (আকাঙ্কা): The teacher has a great hunger for knowledge.
Loyal to (অনুগত): Every citizen must be loyal to the state.
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Idioms
At the top of (শীর্ষে): The boy shouted at the top of his voice.
In full swing (পুরোদমে): The school is in full swing after the vacation.
On the wane (হ্রাসমান): His fame is on the wane now.
Run into debt (ঋণগ্রস্ত হওয়া)— He ran into debt.
Well-to-do (সঙ্গতিপূর্ণ) - He was not born in a well-to-do family.