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low‧er1

1 [only before noun] below something else, especially below something of the same type [≠ upper]:
Nina chewed her lower lip anxiously.
Ruth went down to the lower deck (=lower level on a ship).
Nina chewed her lower lip anxiously.
Ruth went down to the lower deck (=lower level on a ship). your lower limbs (=your legs)
2 [only before noun] at or near the bottom of something [≠ upper]:
the lower slopes of the mountain
She suffers with pain in her lower back.
the lower slopes of the mountain
She suffers with pain in her lower back.3 smaller in number or amount [≠ higher]:
Temperatures will be lower over the weekend.
Temperatures will be lower over the weekend.4 [only before noun] less important than something else of the same type [≠ higher]:
the lower levels of management
the lower levels of management