This is the 3184th most frequent Turkish word.
emeklisi
"Emeklisi" means "retiree" or "retired person" in English.
The word 'emeklisi' here denotes someone who has retired from their profession or occupation, in this case, a teacher.
Babam bir öğretmen emeklisi.
My father is a retired teacher.
'Emeklisi' in this sentence specifies the prior profession of the subject, which they are retired from, 'polis' (police officer).
Amcam bir polis emeklisi olarak sakin bir yaşam sürüyor.
My uncle, as a retired police officer, leads a calm life.
The word 'emeklisine' is used as a dative case form to indicate encountering someone who has retired from a specified profession, 'bankacı' (banker).