1.
If you say that someone cashes in on a situation, you are criticizing them for using it to gain an advantage, often in an unfair or dishonest way.
Residents said local gang leaders had cashed in on the violence to seize valuable land...
PHRASAL VERB: V P on n disapproval
2.
If you ~ something such as an insurance policy, you exchange it for money.
Avoid cashing in a policy early as you could lose out heavily...
He did not ~ his shares.
PHRASAL VERB: V P n (not pron), V P n (not pron), also V n P