Why is the ninth month called September?
1550s (implied in sneakish), perhaps from some dialectal survival of Middle English sniken "to creep, crawl" (c.1200), related to Old English snican "to sneak along, creep, crawl," from Proto-Germanic *sneikanan, which is related to the root of snake (n.). Of feelings, suspicions, etc., from 1748. Transitive sense, "to partake of surreptitiously" is from 1883. Related: Sneaking. Sneak-thief first recorded 1859; sneak-preview is from 1938.
"a sneaking person; mean, contemptible fellow," 1640s, from sneak (v.).
(also sneak preview): After a sneak in Chicago they decided to shelve itverb
To show a movie unexpectedly to an audience in order to assess its appeal: We sneaked it in several cities (1960s+ Movie studio)