There are multiple definitions - click on the translation that matches your context.

garantir

verbo

full

secure

verb

Definitions of secure

English

to get or achieve something, often with difficulty

Funding has been secured for improvements to the busy downtown area.

English

to make free from danger or risk

The worker was not secured to the landing platform with any type of safety harness.

English

to make certain that money that has been lent will be paid back by giving the lender the right to own property belonging to the borrower if the money is not paid back

As the loan is secured on your property, you could lose your house if you cannot afford repayments.