Assert : নিশ্চয় করে বলা;
Related Words
ascertain  ascertains  assert  asserted  asserting  assertion  assertions  assertive  asserts  assort  assorted  assortment  assured  See Words Also In
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Appropriate Prepositions
Adept in (দক্ষ): He is adept in playing football.
Bare of(অনাবৃত, স্বল্প-সজ্জা): The trees of the forest are bare of leaves.
Crave for(আকাঙ্ক্ষা করা): Everyone craves for care.
Entitled to (অধিকারী): He is entitled to a reward for honesty.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
Bring to light (disclose-প্রকাশ করা) The police brought the secret to light.
Breathe one’s last (decease, die- শেষ নিঃশেষ ত্যাগ করা, মরে যাওয়া) The man breathed his last in his native village.
Pick one’s pocket (পকেট মারা)— He tried to pick my pocket.
Take to heart (মর্মাহত হওয়া)- He really took it to heart when I asked him to reconsider.
Wild goose chase (useless pursuit, পন্ডশ্রম) —Do not waste time in wild goose chase.