I read on a post, "The kindest people alive but can freeze hell over with a glance" squad. Is it a kind of English idioms. What does it mean?
I've dug over the internet and I've found out that
"The kindest people alive but can freeze hell over with a glance" squad.
is something that is used to describe the group of people who are born under the zodiac signs of Aquarius, Virgo, Gemini, Taurus, Cancer.
The sentence tries to sum up the characteristics of this group of people using a single sentence. So what does it mean ?
People born under the signs of Aquarius, Virgo, Gemini, Taurus, Cancer are very kind people, perhaps the kindest people among all their counterpart in the other zodiac signs. Even with such a warm-heart, they can become cold and heartless, when circumstances force them to be. This is symbolic, rather than idiomatic. Hell is always referred to as the hottest place (with all the fires, or so they say). Now to freeze hell is a herculean task (hypothetically). If someone can be as cold as that, it means that they can become very heartless, given the unfavorable situations. So in plain words, these people are generally very nice and warm-hearted, but can become cold and heartless when they are angry or annoyed or sad.
NOTE: As far as idioms go, when Hell freezes is an idiom used to describe something that is highly unlikely to happen. But I don't think that has to do anything with the phrase used in your context.
The kindest people alive but can freeze hell over with a glance
is describing a group of people as having a warm and generous nature
The kindest (possible) people alive
but also potentially very emotionally cold (hearted), since they can
freeze hell over
Hell is thought of as being the hottest possible place in human imagination.
To freeze it, something would need to be very cold, and to freeze it
with (just) a glance
something would need to be extraordinarily cold since a glance is an infinitesimally small period of time. Think Elsa in Frozen. It also has the connotation that the emotion from hot to cold can happen fairly quickly.
The idiom in your sentence is
(with) at a glance
meaning very quickly.