The phrase "are designed to guard" is correct and usable in written English.
It can be used when describing the purpose or function of an object, system, or process that is intended to provide protection or security.
Example: "These security measures are designed to guard against unauthorized access to sensitive information."
Alternatives: "are intended to protect" or "are meant to safeguard".
They are designed to guard against spending the prospective windfall on player wages, but not tied to any broader discussion, perhaps a commitment to reduce ticket prices, or increase investment in the grass roots.
They are designed to guard me against my biases and adverse instincts (I think everyone needs explicit processes to protect themselves from known blind spots or vulnerabilities).
They're lightweight, come in five colors (black, dark blue, green, red, purple) and are designed to guard against scratches and short drops.
This SPF 15, nonaerosol, PABA-free spray is designed to guard hair from the drying effects of the sun while shielding the scalp from ultraviolet rays and sunburn.
Some of it the military doesn't want, and some is designed to guard against "potential" threats that don't actually exist.
The developer of I Protect, who has asked to remain anonymous and has not been named as part of the project, explained that the app's interface is designed to guard against this.
In May 1994, however, fourteen months after an abortion doctor was gunned down outside a Florida clinic, he voted against the clinic-protection bill, which was designed to guard the lives of clients--and employees--of the country's abortion facilities.
The current system, with its thicket of regulations, was designed to guard against a repeat of the 1980s, when a scandal involving no-bid contracts and influence-peddling tainted the Koch administration and was punctuated by the suicide of Donald R. Manes, the former Queens borough president.
Its construction begun in 1844, it was designed to guard the strategically important frontier between Canada and the United States; only ruins remain today.
The fact is that the Freedom of the Press under our First Amendment is designed to guard our democracy most especially during those times when the press isn't universally popular.
The record contains numerous expressions reflecting moral disapproval of gays and lesbians and their intimate and family relationships - precisely the kind of stereotype-based thinking and animus the Equal Protection Clause is designed to guard against.
