Refers to the distance covered in one step, or the length of one's stride. Often used when talking about walking speed, gait, or measuring distance by steps.
He walks fast because his stride is long.
I shortened my stride and walked slowly.
Compound of 歩 (ho, 'walking, step') and 幅 (haba, 'width, breadth'). The reading ほはば is a straightforward combination of the on'yomi of 歩 and the kun'yomi of 幅.