daddy longlegs
US /ˈdæd.i ˈlɑːŋ.leɡz/
UK /ˈdæd.i ˈlɑːŋ.leɡz/

1.
a harvestman, an arachnid with a small body and very long, thin legs
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A daddy longlegs was crawling on the wall.
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We saw many daddy longlegs in the garden.
2.
a crane fly, a flying insect with very long legs, resembling a large mosquito
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A large daddy longlegs buzzed around the porch light.
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The children tried to catch the daddy longlegs with a net.
3.
a venomous spider, the cellar spider, known for its long, thin legs and often found in cellars and dark corners
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I found a daddy longlegs in the corner of the basement.
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Despite their reputation, daddy longlegs are generally harmless to humans.