According to the Centers for Disease Control and Prevention (CDC), the flattening of the curve refers to community isolation measures that keep the daily number of disease cases at a manageable level for medical providers.
https://livescience.com/coronavirus-flatten-the-curve.html https://twitter.com/dorahahaha/status/1263828731904155649

The country’s Enhanced Community Quarantine (ECQ) is one way of flattening the curve. To visualize how we are flattening our curve or the pandemic peak, we need to create a graph showing the scenario without an intervention of ECQ (purple) and another scenario with ECQ.

According to UP Covid Pandemic Response Team, without ECQ the highest possible case in a day is 80,000 and even if at 100%-200% error the highest possible case is 10,000.

Now when we compare this to the actual scenario with the intervention of ECQ, the highest case is below 1,000. https://twitter.com/nababaha/status/1258951802021502976?s=20

The community isolation reduced the country’s cases in a day from the possible 10,000-80,000 to below 1,000. We avoided the worst case scenario. We are flattening the curve and we’re able to keep cases at a manageable level for the medical providers. https://twitter.com/nababaha/status/1258952225537187846?s=20

With the comparison between Japan and Philippines, the scope was clearly stated. But here are some observations:
https://www.worldometers.info/coronavirus/ 
https://ourworldindata.org/grapher/total-confirmed-cases-of-covid-19-per-million-people

Thanks Doc @LilMsMalditaMD, for answering my questions kanina.