Synonyms that are in the dictionary are marked in green. Synonyms that are not in the dictionary are marked in red.
Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
Another explanation, though one I have not seen advanced, is that there is a slang usage of “squid” for “quid”, which means a pound of UK currency.
Source: https://www.counterpunch.org/2023/05/18/hitler-wins-again-the-guardian-cartoon-controversy/