Cross up and Tamper with

Cross up verb - To reduce the soundness, effectiveness, or perfection of.

Tamper with and cross up are semantically related. In some cases you can use "Tamper with" instead a verb "Cross up".

Tamper with verb - To handle thoughtlessly, ignorantly, or mischievously.

Cross up and tamper with are semantically related. Sometimes you can use "Cross up" instead a verb "Tamper with".