A cog in the machine : বিরাট ব্যবস্থা বা পরিকল্পনার এক নগণ্য অংশ;
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Appropriate Prepositions
Certain of(নিশ্চিত): Jamal is certain of his success.
Congratulate on(অভিনন্দন জানানো): They congratulated me on my brilliant success.
Creep up (বৃদ্ধি পাওয়া): The prices of are creeping up day by day.
Defend against (রক্ষা করা): We will defend our country against all enemies.
Sorry for (দুঃখিত): He is sorry for his misdeeds.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
Bring to light (disclose-প্রকাশ করা) The police brought the secret to light.
Fish in a troubled water (এলোমেলো অবস্থার সুযোগ নেয়া): He made a lot of money by fishing in a troubled water.
Scapegoat (উদোর পিন্ডি বুধোর ঘাড়ে)—He was made scapegoat of the incident.
To the backbone (to the core, হাড়ে হাড়ে) —The boy is wicked to the backbone.