懂 (w)

(dǒng) to understand; to know

懂事 (w)

(dǒngshì) sensible; thoughtful; intelligent

懂局 (w)

(dǒngjú) to know the business; to know the ropes; in the know; to know one's onions; professional; au fait

懂得 (w)

(dǒngde) to understand; to know; to comprehend

懂行 (w)

(dǒngháng) to know the ropes

懂门儿 (w)

(dǒngménr) one who knows his business; professional; expert; au fait