Lack of knowledge : অজ্ঞান;
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Appropriate Prepositions
Antipathy to/towards (ঘৃনা): I have a strong antipathy to smoking.
Break in (কথার মাঝে কথা বলা): As she was talking, he suddenly broke in, saying, ‘that’s a rat!’
Run into (জড়িয়ে পড়া): He had run into debt.
Similar to (সদৃশ): My T-shirt is similar to yours.
Stick to (দৃঢ়ভাবে লেগে থাকা): We should always stick to our decisions.
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Idioms
Hold water (ধোপে টেকা): This policy will not hold water in this situation.
Lose heart (হতাশ হওয়া) — Do not lose heart in danger.
Put up with (সহ্য করা - tolerate): I could not put up with his behavior.
Run a risk (ঝুকি নেয়া) — He ran a risk to save his life.
Take to heart (মর্মাহত হওয়া)- He really took it to heart when I asked him to reconsider.