Optical illusion : দৃষ্টিবিভ্রম; যা চোখের ভ্রম ঘটায়;
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Appropriate Prepositions
Authority on(বিশেষজ্ঞ পন্ডিত): Kamal was an authority on English literature.
Call in(ডাকিয়া আনা): They called in a doctor.
Catch at(ধরা): A drowning man catches at a straw.
Decide upon (সিদ্ধান্ত করা): We have not yet decided whether we are going to picnic.
Hit upon (পরিকল্পনা নেয়া): Rahim hit upon a new plan.
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Idioms
Birds of a feather (persons of like disposition-একই পর্যায়ের লোক) Bird’s of a feather flock together.
Bear in mind (মনে রাখা): Always bear in mind that you are a daughter of a reputed person.
Die in harness (কর্মরত অবস্থায় মারা যাওয়া): Dr. Sen died in harness.
Fall flat (ফলপ্রসূ না হওয়া): This business is going to fall flat.
In vogue (চালু): This custom is not in vogue at present.