At fault : কিংকর্তব্যবিমূঢ়;
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Appropriate Prepositions
Abide in(বাস করা): I abide in Dhaka with my family.
Attention to(মনোযোগ): He has no attention to his studies.
Charge with(অভিযুক্ত করা): He is charged with killing.
Congenial to(উপযোগী): The atmosphere is congenial to your health.
Cope with(সামলানো বা পেরে উঠা): They cannot cope with the situation.
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Idioms
As a whole (মোটের উপর, সম্পূর্ন এক মনে করে-adv.) Look at life as a whole and you will see that it is meaningful.
Fair and square (সৎ): The learned persons should be fair and square.
Maiden speech (প্রথম বক্তৃতা): His maiden speech fell flat on the audience.
Square meal (পেট ভরা আহার): He is too poor to have a square meal everyday.
Yellow dog (হীন ব্যক্তি) - A yellow dog is always hated by all.