pooh; pah; bah; (today used as a phonetic component in 部[bu4], 倍[bei4]
Originally the same character as 否. A distinguishing mark was added later to the character to differentiate it from 咅. The current meaning "to spit out" is a phonetic loan.
《說文》：“咅，相與語唾而不受也。从丶，从否，否亦聲。，咅或从豆，从欠。”
not