Upstream : স্রোতের প্রতিকূলে;
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Appropriate Prepositions
Careful of (সতর্ক): He is very careful of his fault.
Cure of, for(রোগমুক্ত হওয়া): This man was cured of This drug is a cure for typhoid.
Feed with (কোনো কিছু খাওয়া): They feed the cow with grass.
Look for (খোঁজা): I was looking for the lost phone.
Substitute for (বদলে দেওয়া): This action is substitute for that.
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Idioms
Bring to book (reproach-Start- ভর্ৎসনা করা) The father brought his son to book for his failure in the exam.
Birds of a feather (persons of like disposition-একই পর্যায়ের লোক) Bird’s of a feather flock together.
Bad blood - (শত্রুতা): There has always been bad blood between these families.
Gain Ground (সুবিধা পাওয়া): The wise are said to gain the ground in the long run.
Turn down (refuse, প্রত্যাখান করা) —He turned down my proposal.