Collocations for negotiate - verb

carefully
a carefully negotiated series of concessions

successfully
effectively
individually, separately
Rents are individually negotiated between landlord and tenant.

directly
Theyt were forced to negotiate directly with the rebels.

secretly
seriously
constantly, continually
The parameters of the job are being continually negotiated.

currently

be able to
be prepared to, be willing to
Are the employers really willing to negotiate?

attempt to, seek to, try to
manage to
help (to)

between
to negotiate between the two sides

for
We are negotiating for the release of the prisoners.

on
They have refused to negotiate on this issue.

on behalf of
those negotiating on behalf of the government

with
I managed to negotiate successfully with the authorities.

easily, safely (esp. BrE), successfully
He successfully negotiated the slippery steps.

be difficult to
The flight of steps was quite difficult to negotiate with a heavy suitcase.

Negotiate is used with these nouns as the subject:
union

Negotiate is used with these nouns as the object:
accord, agreement, armistice, arrangement, bend, ceasefire, compromise, contract, curve, deal, detail, discount, extension, fee, hazard, lease, maze, minefield, pact, peace, price, release, settlement, surrender, term, terrain, treaty, truce, turn