Thitherto : সেই সময়ের আগে;
Related Words
thereat  thereto  thirty  thitherto  thitherward  See Words Also In
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Appropriate Prepositions
Based on(প্রতিষ্ঠিত, ভিত্তিক): His information is not based on the correct information.
Guilty of (অপরাধী/দোষী): The convict was guilty of murder.
Identical with (একই ধরণের): You are identical with your sister.
Play on (বাজানো): They play on the piano.
Smile on/upon (অনুগ্রহ করা): Fortune smiles on/upon the brave.
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Idioms
At ease (in peace or pleasure – শান্তিতে বা আরামে) A man who has enemies can not live at ease.
Beggar description - (অবর্ণনীয় হওয়া): The distress of the Muslims in Bosnia beggars description.
Crying need (জরুরী): Mass education is a crying need for India.
Lame excuse (বাজে ওজর): The lame excuse will not do.
To and fro (hither and thither, এদিক ওদিক)-The man is walking to and fro.