outline, condition, approximation, generally
概 centers on the broad, overall shape of something rather than its fine details: an outline, a general condition, or a rough approximation.
概 combines 木 (tree/wood) with 既, which likely contributes the sound and the idea of 'already' or 'completed', suggesting a wooden leveling tool used to smooth or even out grain, giving the sense of a general standard or outline.
A wooden (木) tool is used to level a pile of grain, leaving only the general outline (既 suggests 'already' done). Think of scraping off the excess to see the rough shape: that's the outline or approximation.
For ガイ, imagine a guy using a wooden level to smooth out a rough outline: guy -> ガイ, and he's getting the general shape right.
general idea; concept; notion
outline; summary; overview; synopsis; abstract; abridgment; abridgement
in general; generally; mostly; roughly; largely; mainly; on the whole; by and large
generally; mainly; usually; normally; mostly; for the most part
outline; summary; gist; in brief
unconditionally; as a rule
strong spirit; mettle; backbone; guts; fighting spirit
appearance; look; aspect
approximation; rough estimate; ballpark figure
generally; as a rule
general view; outline
outlook; general situation
introduction; outline; general remarks
overview; outline; rough summary
general; conceptual
summary; generalization; generalisation
outline; summary; abstract
general idea
high level concept; superordinate concept; broader term
company overview