Meaning
馬刺し (ばさし・うまさし, Basashi) is Horse sashimi, a Japanese food (sushi and sashimi).
What is Horse sashimi?
Basashi is raw horse meat, served as sashimi in thin slices dipped in soy sauce, often with ginger and onions added. It is popular in some regions of Japan and is often served at izakaya bars. Fat, typically from the neck, is also found as basashi , though it is white, not pink.