Mainspring : মুখ্য উদ্দেশ্য; ঘড়ির প্রধান চালক-স্প্রিং;
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Appropriate Prepositions
Adhere to (লেগে থাকা, অটল থাকা): You should adhere to your principal.
Agree with, on, to(একমত হওয়া): My father agreed with me on this point, but he did not agree to my proposal to set up a canteen.
Cast aside (ছুঁড়ে ফেলা): As soon as they become rich they cast aside their poor friends.
Convert to(দীক্ষিত): Tom is converted to another religion.
Guard from/against (রক্ষা করা): My parents always guard me from/against bad people.
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Idioms
A bed of roses - (সুখকর অবস্থা): Life is not a bed of roses.
Cut a sorry figure (খারাপ ফল করা): He cuts a sorry figure in the examination.
Gala day (বিশেষ দিন): The Eid–Ul-Fitr is a gala day for Muslims.
In full swing (পুরোদমে): The school is in full swing after the vacation.
Out of order (বিকল): The elevator was out of order.