Weak knees : মনোবলের অভাব; সংকল্পের অভাব;
Related Words
weak knees  weak ness  weakens  weakness  weaknesses  See Words Also In
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Appropriate Prepositions
Abstain from(বিরত থাকা): I am trying to abstain from sweets for my new diet.
Adequate for(পর্যাপ্ত): The loan given by the bank is not adequate for the farming project.
Apathy towards (অনাগ্রহ): The student has great apathy towards his studies.
Attest to(প্রত্যয়ন করা): I like to attest to your ability.
Famous for (বিখ্যাত): Smith is famous for his wisdom.
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Idioms
At a round rate (at the fixed price – নির্ধারিত মূল্যে) Things are selling in the shop at a round rate.
Dead of night (মধ্যরাত্রি): The robbers broke into the house at dead of night.
Laughing stock (হাসির পাত্র)— He is a laughing stock to all.
Safe and sound (নিরাপদে)— He reached home safe and sound.
Through and through (পুঙ্খানুপুঙ্খু রুপে)- He read the poem through and through.