Definitions

1. verb

to move downward or to slope; to turn downward in direction

“The road began to decline sharply as we approached the mountain pass.”

2. noun

a downward slope or incline; a fall or decline in value, amount, or degree

“The city’s population began to decline after the economic crisis.”

3. noun

a slope or incline of a surface, especially a hill or mountain

“The hikers had to navigate the steep decline to reach the summit.”