(bound form) abundant; plentiful; extensive; wide; to win; to gain; to
Phonosemantic compound. 盾 represents the meaning and 尃 represents the sound. Based on the original meaning "fight", which later shifted to "win", "plentiful", and "gamble".
《說文》：“博，大，通也。从十，从尃。尃，布也。”
fight