tst

1. alternativeAlternative form of tch.

   'What did you give for that?' 'A shilling, ma'am.' 'Tst! tst! tst!' said the old lady, disapprovingly.

   1870, Juliana Horatia Ewing, “An Idyll of the Wood”, in The Brownies and Other Tales

   1 more example

   “How about chloroform burns?” suggested Parker. “Tst, tst,” said the doctor, annoyed at not having thought of this himself […]

   1927, Dorothy L. Sayers, Unnatural Death

1. Hong KongabbreviationinformalinitialismInitialism of Tsim Sha Tsui.
2. rail transportThe station code of Tsim Sha Tsui in Hong Kong.

plural TSTs

1. abbreviationcountableinitialismuncountablegeographyInitialism of tunnel seismic tomography: a tunnel geological prediction technique.
2. abbreviationcountableinitialismuncountablemedicineInitialism of tuberculin skin test: a test for tuberculosis infection.
3. abbreviationcountableinitialismuncountablecomputerInitialism of ternary search tree: a type of trie.
4. abbreviationcountableinitialismuncountablebroadcastingInitialism of total story time.