hasty, headlong, quick, rapid
I decided to beat a hasty retreat.

humiliating, ignominious (formal)
orderly, strategic, tactful, tactical
I made a tactful retreat before they started arguing.

beat, make
lead
call (AmE), order, sound
force, force sb into
Eventually the police forced the crowd into retreat.

block, cut off
cover
We covered his retreat with bursts of gunfire.

in retreat
The enemy was now in retreat.

on the retreat
fresh evidence that trade unionism is on the retreat

retreat from
He took part in the retreat from Paris.

retreat into
her retreat into a fantasy world of her own

retreat to
an ignominious retreat to the River Vistula

be in full retreat
On the eastern front the army was in full retreat.

a line of retreat
We succeeded in cutting off the enemy's line of retreat.

favourite/favorite, idyllic, perfect
the perfect retreat for a romantic honeymoon

private, secret
peaceful, quiet
country, mountain, rural, wilderness (esp. AmE)
designed as a gentleman's country retreat

summer, winter
holiday (BrE), vacation (AmE), weekend
presidential
Camp David, the presidential retreat in Maryland

turn sth into, use sth as
She plans to use it as a winter retreat.

retreat for
a summer retreat for the rich

retreat from
They are staying here at their secret retreat from life in the city.

Buddhist, meditation, religious, spiritual, yoga, Zen
silent
I went on a ten-day silent retreat.

annual
I went off on one of my annual retreats.

two-day, week-long, etc.
business, corporate, executive, management (all esp. AmE)
A successful executive retreat can be a powerful tool for addressing changing business conditions.

women's, writers'
family (esp. AmE)

attend, do, go on
She goes on a spiritual retreat for two weeks every summer.

go into
He went into retreat at his country home to escape the attention of the media.

hold
The family held its first retreat last October.

offer
Zen Mountain offers numerous wilderness retreats.