protect against

protect against (someone or something)

1. To guard, defend, or inoculate against someone or something. This vaccine protects against the flu for the entire winter. We need to invest in top-of-the-line security software to protect against cyber attacks. The walls of the encampment were fortified and lined with spears to protect against invaders.
2. To guard, defend, or inoculate someone, something, or oneself against someone or something else. In this usage, a noun or pronoun is used between "protect" and "against." I know you want to protect your kids against injury, but you can't keep them cut off from the real world either. Tourists are being advised to protect themselves against pickpockets in the city center.
See also: protect

protect someone or something against someone or something

 and protect someone or something from someone or something
to shield or preserve someone or something against someone or something. Please come along and protect us against muggers as we walk home. What will protect my car against thieves?
See also: protect
References in classic literature ?
One of those who supported it, leaving the burden to his comrades, advanced to meet him, flourishing a forked stick that he had for propping up the stand when resting, and with this he caught a mighty cut Don Quixote made at him that severed it in two; but with the portion that remained in his hand he dealt such a thwack on the shoulder of Don Quixote's sword arm (which the buckler could not protect against the clownish assault) that poor Don Quixote came to the ground in a sad plight.
Salmon, herring, sardines, mackerel, and other fatty fish may help protect against kidney cancer.
As a control group, the other babies got shots that protect against hepatitis A but not ear infections.
Most individuals carry an array of insurance policies, such as homeowners, auto, life and medical, but a growing number of policyholders are turning to some unique coverages that protect against more unusual exposures.
It seems the public expectation in 1905 that audits should protect against fraud existed before most states had passed public accountancy acts.
For example, an application that cannot tolerate any downtime or loss of data would be a candidate for clustered servers and mirrored storage to protect against device failures.
A FEW forkfuls of vegetables could help protect against cancer, according to experts at the University of Ulster.
a provider of security solutions that protect against data loss, system threats, Internet abuse and unsolicited e-mail, has announced a partnership with Authentium, a provider of authentication and data security solutions for network and desktop computing environments.
To do that, look for one of the only three ingredients that protect against UVA rays: Parsol 1789, also called avobenzone, zinc oxide, or titanium dioxide.
This law requires school districts seeking federal funding for technology to install a "technology protection measure" that will protect against access to material considered harmful for minors.
Standard containers feature a split-lid design with dual openings that protect against accidental exposure to discarded blood needles, lancets, butterfly tubing and syringes.
These safeguards are to ensure the security and confidentiality of customer records and information, protect against any anticipated threats or hazards to the security or integrity of these records, and protect against unauthorized access to or use of these records or information that would result in substantial harm or inconvenience to a customer.
Cell phones are currently required to meet exposure guidelines established by the Federal Communications Commission to protect against acute injury from thermal effects.
Fish--contains omega-3 fatty acids that help prevent heart disease, may fight colon and breast cancers, and may protect against depression.
They protect against sorcery, poison, nightmares, anger and loss of friendship.