HSK 7-9
疙瘩
gēda名
swelling or lump on skin; pimple; knot; lump; preoccupation; problem
他手腕上突然长了个疙瘩。
Tā shǒu wàn shàng tū rán zhǎng le gè gē da.
A lump suddenly appeared on his wrist.
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Also free:
Appears across levels (7-9) in the HSK 3.0 word list.