tach
noun
1.
measuring instrument for indicating speed of rotation
Origin
Backslang for hat (with /tʃ/ substituted for the /h/).
Related words
Word family
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.