well versed
Well versed (adjective) means having a thorough knowledge of a subject or a solid grasp of a skill through study or experience. Example: “She is well versed in employment law.”
How to use well versed
Learner’s notesIn plain EnglishKnowing a subject really well.
Slightly formal and complimentary. It nearly always takes "in": well versed in something, not well versed on or about it. Hyphenated before a noun (a well-versed negotiator), open after the verb (he is well versed).
Nothing to do with poetry — versed here comes from the sense of having gone over something repeatedly, not from verse.
Fill the gap
Can you complete this real example?
She is _____ in employment law.