Off the rails : লাইনচ্যুত; বিপথগামী; বিকল; বেলাইন; খ্যাপা; মাথা-খারাপ;
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Appropriate Prepositions
Abstain from(বিরত থাকা): I am trying to abstain from sweets for my new diet.
Decide upon (সিদ্ধান্ত করা): We have not yet decided whether we are going to picnic.
Look after (দেখাশুনা): He looks after me.
Run into (জড়িয়ে পড়া): He had run into debt.
Taste for (রুচি; পছন্দ): He has a great taste for music.
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Idioms
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
Birds of a feather (persons of like disposition-একই পর্যায়ের লোক) Bird’s of a feather flock together.
Bad book (disfavour-খারাপ নজর —n) The secretary has fallen in the bad book of the manager.
Take one to task (rebuke, তিরস্কার করা)— He took me to task for negligence of duty.
Turn down (refuse, প্রত্যাখান করা) —He turned down my proposal.