well up on

well up on
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. entendido en
Do you know what this plant is? - Ask Jenna. She's well up on botany.¿Sabes qué es esta planta? - Pregúntaselo a Jenna. Es entendida en botánica.
b. filoso en
Regionalism used in Central America: Guatemala, El Salvador, Honduras, Nicaragua, Costa Rica, and Panama
(Central America)
Regionalism used in Mexico
(Mexico)
He works as an engineer, but he's also well up on music production.Trabaja como ingeniero, pero también es filoso en producción de música.
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