Collocations for grip - noun

firm, good, secure, strong, tight | cruel, crushing, fierce, iron, painful, punishing, vice-like
Her upper arms were seized in an iron grip.

restraining

have
He still had a firm grip on my arm.

get, take
Taking a tight grip on the hook, he began to pull it towards himself.

keep
Keep a secure grip on the rope at all times.

lose
She slipped and lost her grip of the rope.

tighten
Robert tightened his grip on her shoulder.

loosen, relax, release, slacken

tighten | loosen, relax, slacken
His grip slackened and she tore herself away.

in a/sb''s ~
Hold the microphone in a firm grip. | She was powerless in his vice-like grip.

~ on
She relaxed her grip on the door frame.

firm, iron, powerful, strong, tight, vice-like

have
The Church does not have a strong grip on the population.

get, take
The government needs to get a grip on this problem. | (informal) Get a grip! (= take control of yourself, your life, etc.)

keep
We need to keep a tight grip on costs.

strengthen, tighten
They managed to strengthen their grip on the southern part of the country.

lose
(informal) Sometimes I feel I''m losing my grip (= losing control of my life, etc.)

in sth''s ~
Winter still held them in its iron grip. | a country in the grip of recession

~ on
The government does not seem to have a very firm grip on the economy.

come/get to grips with sth
(= to begin to take control of sth or understand sth difficult) I''m slowly getting to grips with the language.