lose one's grip
lose a secure grasp or hold of something

[TahlilGaran] Dictionary of Contemporary English ▲

lose grip
lose (your) grip
to lose your ability to control or deal with a situation.
He was losing his grip at work and knew it was time to retire.

It suggests that the ruling party is losing its grip on the middle classes in some of the bigger cities.
(often + on)
lose (your/its) grip
to be unable to control something.
Changes in your body can make you feel like you're losing your grip.

For many years now the old political parties have been losing their grip on the South.

lose (your/its) grip
to be unable to control something.
Changes in your body can make you feel like you're losing your grip.

For many years now the old political parties have been losing their grip on the South.

[TahlilGaran] English Idioms Dictionary ▲

lose one's grip
1. lose a secure grasp or hold of something
The rock climber lost his grip and fell off the side of the cliff.

2. lose control of a situation
I think that our boss is losing his grip in his ability to control the workplace.

The young teacher seems to be losing her grip on the situation in her classroom.

[TahlilGaran] English Idioms Dictionary ▲

lose one's grip
v. phr. To fail in control or command; lose your strength, force, or ability to lead.
Mr. Jones began to lose his grip: he no longer wanted the hard jobs, and he left decisions to others.
When a locomotive engineer loses his grip, he is no longer trusted with express runs.

[TahlilGaran] English Idioms Dictionary ▲