Free of cost : নিখরচা;
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Appropriate Prepositions
Abide in(বাস করা): I abide in Dhaka with my family.
Caution against(সাবধান): Take all cautions against the danger.
Dedicate to (উৎসর্গ করা): His pfe is dedicated to the welfare of the country.
Feed with (কোনো কিছু খাওয়া): They feed the cow with grass.
Hit upon (পরিকল্পনা নেয়া): Rahim hit upon a new plan.
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Idioms
All up with - (পুরোপুরি, হতাশ, সব আশা শেষ): If we can't, it's all up with the councillor.
Bear in mind (remember— মনে রাখা —V): You should also bear in mind the additional costs of the mortgage.
Gain Ground (সুবিধা পাওয়া): The wise are said to gain the ground in the long run.
On the contrary (বিপরীত পক্ষে): I do not hate him; on the contrary I love him.
Speed money (ঘুষ; উৎকোচ): He hankers after speed money.