/ ˈtɪdli; NAmE / adjective ( BrE , informal )
1.
slightly drunk
2.
very small
SYN tiny
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WORD ORIGIN
sense 1 mid 19th cent. (as a noun denoting an alcoholic drink, particularly of spirits): perhaps from slang tiddlywink , denoting an unlicensed public house. The current sense dates from the early 20th cent.
sense 2 mid 19th cent.: variant of colloquial tiddy , of unknown origin.