also: そだちがよい
expression, i-adjective (yoi/ii class)
well-bred; of good upbringing
Describes a person whose manners, behavior, or character reflect a good upbringing. Often used as a compliment.
彼女は育ちがいいから、いつも丁寧な言葉遣いをする。
She is well-bred, so she always uses polite language.
育ちがいい人は、テーブルマナーが自然に身についている。
People of good upbringing naturally have good table manners.
Compound of 育ち (upbringing) + が (subject marker) + いい (good). The phrase literally means 'upbringing is good'.