Ill-founded : ভিত্তিহীন; অমূলক; বুনিয়াদহীন; অহেতুক; মন্দ উপায়ের;
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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.
Ask for (কোনো কিছু চাওয়া): Do not ask him for any help because he doesn’t like to help anyone.
Break in (কথার মাঝে কথা বলা): As she was talking, he suddenly broke in, saying, ‘that’s a rat!’
Make up of (গঠিত): Village is made up of many homes.
Object to (আপত্তি করা): He objected to my proposal.
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Idioms
ABC - (প্রাথমিক জ্ঞান): I don't know the ABC of politics.
Do yeoman’s service (বিশেষ উপকার করা): Freedom fighters have done yeoman’s service for country.
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
Pick a quarrel (ঝগড়া করা)—Do not pick a quarrel.
Three score (ষাট): He is happy as his brother got three score.