Meaning: This sentence describes the children's creative play in the snow, emphasizing the construction of a snow fort for hiding and imaginative play.
Choice of Words: A "snow fort" is a structure made of packed snow, often used as a place to hide or play in. "Hide" means to conceal oneself from view. "Play pretend" means to engage in imaginative play, often involving make-believe scenarios. When you put these words together, you get a picture of children building a snow fort as a place to hide and engage in imaginative play, which is a classic winter activity.