Definition of well-plucked in US English:
well-plucked
adjective
1Thoroughly or fully plucked.
2Informal. Plucky, fearless. Also in "well-plucked one (also 'un)": a plucky or fearless person. Now archaic and rare.
Origin
Early 17th century; earliest use found in James Melville. Partly from well + plucked.
Pronunciation
well-plucked
/ˌwɛlˈplʌkt/