Definition of hill noun from the Oxford Advanced Learner's Dictionary

hill

noun

hɪl

hɪl

1 [countable] an area of land that is higher than the land around it, but not as high as a mountaina region of gently rolling hillsa hill farm/town/fortThe house is built on the side of a hill overlooking the river.I love walking in the hills (= in the area where there are hills). see also anthill, foothill, molehill

2 [countable] a slope on a roadAlways take care when driving down steep hills.a hill start (= the act of starting a vehicle on a slope) see also downhill, uphill3 the Hill [singular] (North American English, informal) = Capitol Hill

Idioms

a hill of beans

(old-fashioned, North American English, informal) something that is not worth much

over the hill

(informal) (of a person) old and therefore no longer useful or attractiveYoungsters seem to think you're over the hill at 40!

more at as old as the hills at old