what do the colors of portugal's flag mean
The green represented the hope of the Portuguese people, while the red represented the blood of those who died serving the nation.
Flag of Portugal
 It claims that the green represented the hope of the Portuguese people, while the red represented the blood of those who died serving the nation.
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Flag of Portugal [SEP] Colours
The explanation for the green and red colours that make up the background field arose during the Estado Novo period, the nationalist authoritarian regime that held power from 1933 to 1974. It claims that the green represented the hope of the Portuguese people, while the red represented the blood of those who died serving the nation. Despite the fact that these colours never constituted a major part of the national flag until 1910, they were present in several historical banners during important periods. King John I included a green Aviz cross on the red bordure of his banner. The red cross of the Order of Christ was used over a white field as a naval pennon during the Discoveries and frequently on ship sails.