Question

what do u under by atleast........​

Answer 1

Explanation:

At" is a preposition, but it acts on the noun "least" to create an adverbial phrase "at least". It's exactly the same grammar as something like "on the table": preposition+noun->adverb. That's how most prepositional phrases work (although a few become adjectives or nouns rather than adverbs

Answer 2

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You use at least to say that a number or amount is the smallest that is possible or likely and that the actual number or amount may be greater.