Hallmark : নির্দশক ছাপ;
Related Words
hall mark  hall-mark  hallmark  hallmarked  hallmarks  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.
Feed with (কোনো কিছু খাওয়া): They feed the cow with grass.
Guess at (অনুমান করা): It is difficult to guess at the age of women.
Remedy for (প্রতিকার): There is no remedy for his misbehavior.
Senior to (বয়সে বড়): He is senior to me by two years.
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Idioms
At least (in the lowest estimate- কমপক্ষে) He is the owner of thirty lakh taka at least.
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
Crocodile tears (মায়াকান্না): He shed crocodile tears at our misery.
Out of order (বিকল): The elevator was out of order.