Thitherto : সেই সময়ের আগে;
Related Words
thereat  thereto  thirty  thitherto  thitherward  See Words Also In
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Appropriate Prepositions
Authority on(বিশেষজ্ঞ পন্ডিত): Kamal was an authority on English literature.
Careless of(অসতর্ক): Do not be careless of your health.
Easy of (সরল): The teacher is easy of approach.
Shocked at (মানসিক আঘাতপ্রাপ্ত): Snigdha was terribly shocked at the death of Ratul.
Thirst for (তৃষ্ণা, আকাঙ্ক্ষা): A wise man has no thirst for wealth.
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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.
Back and forth (এদিক ওদিক) The mad man was running back and forth in the hospital.
Fair play (প্রতারণা বিহীন নীতি বা কাজ): I believe in the practice of fair play in my business.
In no time (শীঘ্র): He will finish the work in no time.
With might and main (যথা শক্তি দিয়ে) —He tried with might and main to help me.