unexpectedly or without warning
হঠাৎ বা অপ্রত্যাশিতভাবে
"My old friend called me out of the blue after ten years."
"দশ বছর পর আমার পুরনো বন্ধু হঠাৎ করে আমাকে ফোন করল।"
a constant source of annoyance or trouble
a secret agreement made by powerful people
to change your opinion or attitude
to look after someone and help them develop
to survive, one must adjust to the new conditions
to suddenly become very wealthy