expression
well done; good job
A polite, set phrase used to praise someone's work, often stamped on homework or used in educational settings. Equivalent to a gold star sticker.
先生が宿題に「よくできました」と書いてくれた。
The teacher wrote 'well done' on my homework.
テストで満点を取ったら、お母さんが「よくできました」と言ってくれた。
When I got a perfect score on the test, my mother said 'good job'.
A polite past-tense form of よくできる (to be able to do well), literally meaning 'you did well'. The phrase is a fixed expression used as praise.