Thitherto : সেই সময়ের আগে;
Related Words
thereat  thereto  thirty  thitherto  thitherward  See Words Also In
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Appropriate Prepositions
Absorbed in(মগ্ন): I am absorbed in my study.
Annoyed with(ব্যক্তির সাথে বিরক্ত হওয়া): I am annoyed with him.
Appear at/in(উপস্থিত হওয়া): I should appear at/in the exam hall in time.
Attacked by(আক্রান্ত ব্যক্তিবাচক): He has been attacked by a gang of robbers.
Repent of (অনুতাপ করা): I repented of my past.
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Idioms
At a round rate (at the fixed price – নির্ধারিত মূল্যে) Things are selling in the shop at a round rate.
For good (চিরদিনের জন্য): He left the house for good.
Foul play (অসদাচারণ করা): We feared that he had met with foul play.
In full swing (পুরোদমে): The school is in full swing after the vacation.
To play on a fiddle (অনর্থক সময় নষ্ট করা - To waste time)-He played on a fiddle by nature.