Keep an eye on : নজরে রাখা; নজর রাখা; চক্ষুয় রাখা; চক্ষু দেত্তয়া;
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keep an eye on  keep on  See Words Also In
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Appropriate Prepositions
Angry for (কোন কাজে রাগান্বিত হওয়া): Rahim was angry with me for my having done this.
Attain to (লাভ করা): He will not attain to his objective so soon.
Convinced of (আশ্বস্ত): You are convinced of his product.
Hard of (কানে খাটো বা কম শোনা): Ratan is a hard of hearing.
Indebted to (ঋণী থাকা): We are indebted to the great leaders of the country for their service.
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Idioms
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
In cold blood (ঠান্ডা মাথায়): They committed this murder in cold blood.
Man of straw (অপদার্থ): We do not care for a man of straw like you.
Speed money (ঘুষ; উৎকোচ): He hankers after speed money.
Wild goose chase (useless pursuit, পন্ডশ্রম) —Do not waste time in wild goose chase.