How figure of speech in question4 is metaphor please explain in detail

Dear Student,

A metaphor is a figure of speech that describes an object or action in a way that isn't literally true, but helps explain an idea or make a comparison. It is used in the line 'the merry children spilling out of their homes'. While driving to the airport the poet turned her attention out of the car’s window to distract herself from the fear of losing her mother. She saw children coming out of their homes and playing merrily, which was in sharp contrast to her ageing mother. Thus, there is the use of metaphor to explain the contrast between beginning of life and fear of death.

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