Occasional : আকস্মিক, সামিয়ক ঘটনাক্রমে সংঘটিত
Related Words
occasional  occasionalism  occasionally  See Words Also In
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Appropriate Prepositions
Attend on/upon (সেবা করা): We should attend on/upon the ailing patient.
Caution against(সাবধান): Take all cautions against the danger.
Concerned for (উদ্বিগ্ন): The parents are concerned for their growing children.
Depend upon (নিশ্চিত থাকা, আস্থা রাখা): Sumi depended upon his word.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
At home (comfortable— আরাম) He feels at home in Dhaka now.
At every step (প্রতি পদে পদে): There are dangers at every step in our life and yet we want to live.
Black sheep - (কুলাঙ্গার): Stay away from the Black sheep.
Fair and square (সৎ): The learned persons should be fair and square.
Short cut (সংক্ষিপ্ত পথ)— He comes by this shortcut.