Example : Arrest the downward trend.
Check the growth of communism in South East Asia.
Contain the rebel movement.
Turn back the tide of communism.

Synonyms : arrest, check, contain, stop, turn back

Example : She forbore a snicker.

Synonyms : forbear

Example : The scientists held off announcing their results until they repeated the experiment.

Synonyms : hold off, wait

Example : The landlord retained the security deposit.
I reserve the right to disagree.

Synonyms : hold, keep back, retain

Example : She conceals her anger well.

Synonyms : conceal, hold in

Example : Hold back your anger.
Keep your cool.
She struggled to restrain her impatience at the delays.

Synonyms : keep, keep back, restrain