Un smooth : অমসৃণ;
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Appropriate Prepositions
Abstain from(বিরত থাকা): I am trying to abstain from sweets for my new diet.
Avail (oneself) of(সুযোগের স্বব্যবহার করা): I shall avail myself of the first trip to London tomorrow.
Feed on (খেয়ে বাঁচা): The cow feeds on grass.
Guess at (অনুমান করা): It is difficult to guess at the age of women.
Make from (কোনো উপকরণ দ্বারা সরাসরি তৈরী নয় বোঝাতে): Paper is made from bamboo.
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Idioms
At least (in the lowest estimate- কমপক্ষে) He is the owner of thirty lakh taka at least.
At random (indiscriminately—এলোপাথাড়ি-adv.) He talks at random like a mad man.
Bear in mind (remember— মনে রাখা —V): You should also bear in mind the additional costs of the mortgage.
Bear (a) grudge (bear hostility to— শত্রুতা বা বিদ্বেষ পোষন করা—V) We should not bear (a) grudge against our brethren.
Cock and bull story (আষাঢ়ে গল্প): You must be ashamed of your cock and bull story.