The children played hide-and-seek in the backyard happily.
Meaning: This means the children were playing a game where one person hid and the others searched for them, and they were enjoying the game.
Choice of Words: Hide-and-seek is a noun that refers to a game in which one person hides and the others try to find them. Happily is an adverb that describes how something is done, in this case, the playing was done with happiness.
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