Co-operator : সহযোগী; সহায়ক;
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Appropriate Prepositions
Argue against (বিপক্ষে বলা): She argued against the bill.
Authority on(বিশেষজ্ঞ পন্ডিত): Kamal was an authority on English literature.
Aware of(অবগত): I am not aware of his dishonesty.
Compete with(প্রতিযোগিতা করা): He does not pke to compete with
Enter into (কোনো কিছুতে আবদ্ধ হওয়া): pma entered into a new agreement.
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Idioms
Die in harness (কর্মরত অবস্থায় মারা যাওয়া): Dr. Sen died in harness.
Fall flat (ফলপ্রসূ না হওয়া): This business is going to fall flat.
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
Salt of the earth (গুরুত্বপূর্ণ ব্যক্তিবর্গ) —The salt of the earth is remembered always.
Turn down (refuse, প্রত্যাখান করা) —He turned down my proposal.