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
Akin to(সমজাতীয়): These are akin to one another.
Alarm at, by, for(আশংকা করা/শঙ্কিত হওয়া): I was not alarmed at/by the news, but I was alarmed for their safety.
Congratulate on(অভিনন্দন জানানো): They congratulated me on my brilliant success.
Guard from/against (রক্ষা করা): My parents always guard me from/against bad people.
Sentence to, for (দন্ডাদেশ দেওয়া): He was sentenced to death for murder.
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Idioms
Bad blood - (শত্রুতা): There has always been bad blood between these families.
For good (চিরদিনের জন্য): He left the house for good.
Gift of the gab (বাকপটুতা): An advocate should have the gift of the gab.
Through and through (পুঙ্খানুপুঙ্খু রুপে)- He read the poem through and through.
Well up (সুপন্ডিত)- Dr. Shahidullah was well-up in Bengali language.