英语词源字典 - 在线词源网站

bitsy (adj.)[bitsy 词源字典]: 1883, from plural of bit (n.1) or a variant of bitty.[bitsy etymology, bitsy origin, 英语词源]
itsy-bitsy (adj.): "charmingly small," 1890, from itty and/or bitsy. Bitsy-itsy is recorded from 1875.
two bits (n.): "quarter dollar," 1730, in reference to the Mexican real, a large coin that was divided into eight bits; see bit (n.1). Compare piece of eight (see piece (n.)). Two bits thus would have equaled a quarter of the coin. Hence two-bit (adj.) "cheap, tawdry," first recorded 1929.