Word Origin & History
1630s, "closely acquainted, very familiar," from L.L. intimatus, pp. of intimare "make known, announce, impress," from L. intimus "inmost" (adj.), "close friend" (n.), superl. of in "in." Used euphemistically of women's underwear from 1904.
1530s, back formation from intimation
"action of making known," mid-15c., from M.Fr. intimation (late 14c.), from L.L. intimationem (nom. intimatio) "an announcement" (in M.L. "a judicial notification"), from intimare (see intimate