Definition from Wiktionary, the free dictionary
By partial reversal of the name of its inventor "F. B. Gilbreth", American engineer
therblig (plural therbligs)
- (time and motion study) Any of a set of fundamental motions required for a worker to perform a manual operation.
1973, Robert A. Heinlein, Time Enough for Love:
- Minimize your therblig until it becomes automatic; this doubles your effective lifetime—and thereby gives time to enjoy butterflies and kittens and rainbows.