DEF: one who is at the top, the best one.
Merriam-Webster Online Dictionary
top gun (noun) one who is at the top (as in ability, rank, or prestige)
Top gun
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Sound made by babies, water running over rocks, or a boiling liquid.
Édith Piaf was a French singer. Noted as France’s national chanteuse, she was one of the country’s most widely known international stars.