पाँव उखड़ने लगना  =  be defeated
On the arrival of the indian artillery the pak army started losing groundthis gas lamp gradually lost ground to electric lighting.

पूछ कम होना  =  be out of vogue
This gas lamp gradually lost ground to electric lighting.

पीछड़ने लगना  =  lose gradually
The leader is losing ground as the rest of the runners accelerate .

पीछे हटना  =  retreat
Crowds losing ground before police fire hoses.