Irretrievable : পুনরূদ্ধারের অসাধ্য;
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Appropriate Prepositions
Appetite for(ক্ষুধা): He has no appetite for food.
Argue against (বিপক্ষে বলা): She argued against the bill.
Despair of (নিরাশ হওয়া): Do not despair of further improvement.
Fond of (প্রিয়/অনুরাগী): Children are fond of sweets.
Pleased with (সন্তুষ্ট): Shamim is pleased with all his employees.
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Idioms
At times (মাঝে মাঝে): He at times comes here.
As a rule (নিয়ম অনুসারে.) As a rule, she kept silent in the meeting.
Bear (a) grudge (bear hostility to— শত্রুতা বা বিদ্বেষ পোষন করা—V) We should not bear (a) grudge against our brethren.
Let loose (বল্গাহীনভাবে ছেড়ে দেয়া): He let his horse loose in the field.
Take to one's heels (to run away, পালানো)- They took to their heels when they saw the policeman approaching.