Learner's definition of PARLANCE
[noncount] formal
: language used by a particular group of people（某人群使用的）说法，用语 -
In military parlance, “bug out” means “to retreat.” [=for people in the military, “bug out” means “to retreat”]在军事用语中，bug out是“撤退”的意思。
-
The book introduced many readers to terms that are now in common parlance. [=used by many people in ordinary conversation]这本书向广大读者介绍了一些现已成为通用语的术语。