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

1.
diradarsi i capelli in cima, diventare calvo
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.
Ha iniziato a diradarsi i capelli in cima alla testa verso la fine dei vent'anni.
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My grandfather used to joke that he was just thin on top, not bald.
Mio nonno scherzava dicendo che era solo diradato in cima, non calvo.