/ tɪt; NAmE / noun
1.
[ usually pl. ] (also titty ) ( taboo , slang ) a woman's breast or nipple
2.
( BrE , slang ) a stupid person
3.
a small European bird. There are several types of tit :
a great tit
—see also blue tit
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WORD ORIGIN
sense 3 mid 16th cent.: probably of Scandinavian origin and related to Icelandic titlingur sparrow. Earlier senses were small horse and girl ; the current sense dates from the early 18th cent.
senses 1 to 2 Old English tit teat, nipple , of Germanic origin; related to Dutch tit and German Zitze . The vulgar slang use was originally US and dates from the early 20th cent.