たんこぶ

noun

bump; lump; swelling

Colloquial word for a bump or swelling, especially on the head or forehead. Often used for a goose egg from a knock.

See also: こぶ

• 転ころんでおでこにたんこぶができた。

  I fell and got a bump on my forehead.

• 頭あたまをぶつけて大おおきなたんこぶができちゃった。

  I bumped my head and got a big lump.