be thin on top
US /bi θɪn ɑn tɑp/
UK /bi θɪn ɑn tɑp/

1.
頭頂頭髮稀疏, 開始禿頭
to have very little hair on the top of one's head; to be going bald
:
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He started to be thin on top in his late twenties.
他在二十多歲時開始頭頂頭髮稀疏。
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My grandfather used to joke that he was just thin on top, not bald.
我爺爺以前開玩笑說他只是頭頂頭髮稀疏,而不是禿頭。