Touch wood : অদৃষ্টের দয়া পাত্ত!;
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Appropriate Prepositions
Abstain from(বিরত থাকা): I am trying to abstain from sweets for my new diet.
Admit to(ভর্তি করা): The boy was admitted to class Nine.
Aim at(আঘাত করার জন্য লক্ষ্য স্থির করা): The hunter aimed at the tiger.
Anxious about (কোনো কিছুর ব্যাপারে চিন্তিত বা উদ্বিগ্ন): Karim is anxious about his father’s death. Karim is anxious for getting a job.
By heart (মুখস্থ): Kamal learnt to poem by heart.
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Idioms
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
At-fault (guilty-কিংকর্তব্যবিমূঢ়, অপরাধ, দোষ adj.) You are at fault.
Lump sum (এক কালীন) — He gave us lump sum money.
Turn down (refuse, প্রত্যাখান করা) —He turned down my proposal.
Well-to-do (সঙ্গতিপূর্ণ) - He was not born in a well-to-do family.