Fallen out : কলহ করা; ঘটা;
Related Words
fall in with  fallen down  fallen out  fallen through  flame out  fluent  See Words Also In
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Appropriate Prepositions
Attend on/upon (সেবা করা): We should attend on/upon the ailing patient.
Fond of (প্রিয়/অনুরাগী): Children are fond of sweets.
Guard from/against (রক্ষা করা): My parents always guard me from/against bad people.
Lost in (মগ্ন): Simon is lost in meditation.
Quarrel with (ঝগড়া করা): Some girls quarreled with one another.
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Idioms
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
Fall flat (ফলপ্রসূ না হওয়া): This business is going to fall flat.
Out of sorts (সামান্য অসুস্থ): The baby is out of sorts after playing.
Out of order (বিকল): The elevator was out of order.
Read between the lines (understand the significance, অন্তনিহিত অর্থ বুঝা) Try to read between the lines of the letter.