By night : রাতের বেলায়;
Related Words
be naughty  benighted  by night  See Words Also In
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Appropriate Prepositions
Attest to(প্রত্যয়ন করা): I like to attest to your ability.
Avail (oneself) of(সুযোগের স্বব্যবহার করা): I shall avail myself of the first trip to London tomorrow.
Careful of (সতর্ক): He is very careful of his fault.
Die of (রোগে মরা): Many people died of cholera.
Good for, at (ভাল): This man is good for nothing. He is good at English.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
At home (comfortable— আরাম) He feels at home in Dhaka now.
On the whole (মোটের ওপর): On the whole, his conduct is good.
Pave the way (সুপ্রসন্ন করা) – I am sure I can pave the way for your success.
Salt of the earth (গুরুত্বপূর্ণ ব্যক্তিবর্গ) —The salt of the earth is remembered always.