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safeguard against (someone or something)
1. To do what is necessary to ward off someone or something or to ensure that something bad does not happen. These trains have multiple fail-safes built into them to safeguard against derailing or losing control. I'm probably paranoid, but I always lock both the front and rear wheels of my bike to safeguard against theft, even if I'm just going into a store for five minutes.
2. To put protections in place to ward off someone or something from someone or something else or to ensure that something bad does not happen to someone or something. In this usage, a noun or pronoun is used between "safeguard" and "against." I know you want to safeguard your kids against any and all pain, but you can't shield them from everything, nor should you. Our security company specializes in safeguarding small businesses against burglars.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
safeguard against someone or something
to protect against someone or something. We will try to safeguard against accidents. How can I safeguard against prowlers?
safeguard someone or something against someone or something
to protect someone or something against someone or something. We will take action that will safeguard you against a recurrence of the unpleasantness. I will safeguard my family against the prowler.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.