noun, used as a suffix
choosing; selecting; deciding on
Noun suffix attached to another noun to mean 'choosing that thing'. Common in compounds like 嫁選び (choosing a bride) or 服選び (choosing clothes).
See also: 嫁選び
彼は嫁選びに慎重だった。
He was careful in choosing a bride.
今日は一日中、服選びをしていた。
I spent the whole day choosing clothes today.
選ぶ is the verb 'to choose'; 選び is the nominalized suffix form used in compounds.
Nominalized form of the verb 選ぶ (to choose), used as a suffix in compound nouns.