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
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.

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
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
See also:
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.
They say the supplement, used in pregnancy to protect against birth defects, keeps blood vessels working better.
It offers validation to protect against spoofing, anti-flooding to protect from floods of messages and message filtering to detect and remove spam, scam and OTA messages and help prevent the download of viruses.
Madison thought the Bill of Rights unnecessary because the Constitution had not granted government the powers the Bill of Rights would protect against. He thought it dangerous because rights not listed might be thought to be unprotected.
882(c) have required a foreign corporation to file its income tax return generally within 18 months of the ordinary due date for filing the return, to protect against a denial of deductions and credits.
Also, the concepts of new kinds of products resonate with consumers when distributors explain that they protect against investment risk and outliving one's money, so long as the distributors avoid using the words "annuity" or "annuitization."
It is unlikely that all of these drugs will effectively protect against H5N1.
As a control group, the other babies got shots that protect against hepatitis A but not ear infections.
The nozzle body is coated to protect against abrasion and corrosion.
Protect against cybercrime with Panda Software's Platinum 2006 Internet Security and Titanium 2006 Antivirus + Antispyware.
* Clem Furlong, University of Washington, to attempt to increase the activity of human PON1 enzyme to levels sufficient to protect against paraoxon exposure in a mouse model.
"One particular antioxidant that's unique to coffee may protect against gallstones, Alzheimer's and Parkinson's," says DeRupo.
FACTA requires every person or company that possesses such information to take "reasonable measures" to protect against unauthorized access or use of the information.
Worldwide Computer Products News-11 August 2005-Juniper Networks IDP systems protect against network-based attacks(C)1995-2005 M2 COMMUNICATIONS LTD