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礼儀正しくしなさい

be polite

→ 礼儀
phrase Rare #24,270
be polite A direct command telling someone to behave politely or show good manners. しなさい makes the expression directive, often used by a parent, teacher, or other authority figure.
JA: お客様には礼儀正しくしなさい。
EN: Be polite to the guests.

先生には礼儀正しくしなさいね。

Be polite to your teacher.

もっと礼儀正しくしなさい。

Be more polite.

両親には礼儀正しくしなさい。

Be respectful to your parents.

道を尋ねる時はできるだけ礼儀正しくしなさい。

When asking for directions, be as polite as possible.