Thanks to Eiríkr Útlendi for guiding me to the answer. I will summarize it for everyone's convenience down below:
If you search but nothing appears in the dictionary, please make sure you include the Kanji.
stands for which has the following definitions (weblio):
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With that being said, it would be safe to translate `` to be `with slanted eyes`. This is further supported by Chocolate's related link (: (na-adj) with eyes downcast).
Hope this helps.