1.
blur; out-of-focus area
the aesthetic quality of blur in out-of-focus areas of a photograph, now used internationally as a photography term
2.
funny man; straight man's partner
in Japanese comedy (especially manzai), the person who makes absurd statements or acts silly, contrasted with the tsukkomi
Photography (SENSE 1)
'Bokeh' has been adopted into English as a photography term. It refers to the quality of the out-of-focus areas in an image.
Comedy (SENSE 2)
In manzai comedy, the ボケ makes absurd statements or acts foolish, while the ツッコミ (straight man) corrects or retorts.
Aging (SENSE 3)
Used to describe age-related cognitive decline. Can be considered somewhat casual or even insensitive depending on context.
Related Words
Related:
ツッコミ (straight man (comedy))
Related:
ピント (focus (camera))
Compare:
ギャグ (gag, joke)
Compare:
漫才コンビ (manzai duo)