兼 means “double as, combine”

かねる · kaneru

Also: concurrently, and, beforehand, in advance

Kun'yomi (Japanese reading)
かねる
On'yomi (Chinese reading)
ケン

JLPT N1 · Taught in secondary school · 10 strokes

The story

A hand (⺕) gripping two stalks of grain at once, the traditional picture behind 兼: doing two things together. 兼ねる is to double as, 兼用 is dual use, and the polite 〜かねます means "I'm afraid I can't".

Used in 兼ねる (kaneru, to double as), 兼用 (ken'you, dual use), and 兼任 (kennin, holding two posts)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.