Coming back to spell this bit out more fully :

what genocide entails and how it has been defined under the United Nations Genocide Convention

The many ppl calling Israel's treatment of the Palestinians genocide aren't doing it for rhetorical effect. They mean it properly and definitively and here, just as one of many examples, are two Jewish writers explaining why they call it genocide, making direct reference to the 1948 UN Convention :

And Israel has issued a directive to those remaining that amounts to an ultimatum: leave northern Gaza, all 1.1 million of you, “for your own safety” – in other words, evacuate or risk death in the impending blitz and ground invasion.

The United Nations says such a mass evacuation is “impossible” and has potentially “devastating humanitarian consequences,” pleading with Israel to rescind the order. A UN special rapporteur was clear, calling the order “a crime against humanity and a blatant violation of international humanitarian law.”

We call it something else: unfolding genocide.

There is no other word to describe the pageantry of death embraced by Israel’s politicians. Under international law, genocide requires two things: an “intent to destroy, in whole or in part, a national, ethnical, racial or religious group,” and then the attempted destruction of that group. Without intent, these actions amount to ethnic cleansing. If deliberate, they are considered genocide.

Israel seems to be laying the groundwork for destroying Gaza and its residents: President Isaac Herzog on Friday said Gazans are not innocent civilians: “It is an entire nation out there that is responsible. It’s not true this rhetoric about civilians not aware, not involved. It’s absolutely not true.” This contradicts international law that prohibits collective punishment and the targeting of civilians, both of which amount to war crimes. It also suggests that Israel will show no restraint in its attacks on Gaza.

Forced displacement, which Israel has begun, is an established precursor to extermination – one of the final steps, in fact, in the 10 stages of genocide cited internationally by genocide scholars and institutions, including by Holocaust museums across the world. These steps, which can occur simultaneously, include “dehumanization,” acts that deprive groups of water and food, and the false labeling of military operations as “counter-terrorism.”

We are there. Israeli officials are invoking terrorism to justify their indiscriminate bombing campaign, while the Israeli defense minister said that they are fighting “human animals” – dehumanising language that is always used in the lead-up to genocide. And an unnamed Israeli defense official was quoted as saying: “Gaza will eventually turn into a city of tents. There will be no buildings.”

Prime Minister Benjamin Netanyahu has repeated his promise that the mass death inflicted thus far is “only the beginning.” The Gaza strip is under “complete siege,” the defense minister said, and cut off from electricity, fuel, food and water. A Knesset member openly called for a second Nakba, referring to the mass displacement of Palestinians in 1948. Again, to deliberately create another Nakba would amount to genocide in Gaza.

The rhetoric has made it down to the rank-and-file, too: an Israeli soldier said on national television that this war is not just with Hamas, but “with all the civilians.” This indiscriminate erasure of Palestinians in Gaza would, without doubt, be genocide – as an Israeli genocide scholar has himself stated. The precursors to genocide are actively unfolding before our eyes.

https://www.theguardian.com/commentisfree/2023/oct/18/israel-gaza-hamas-palestinians

(There are a number of links in the quoted text which I haven't reproduced here, including one where they link to the Convention)