1Attached after a verb's -te form, a casual way of saying "try ~ing" or "go ahead and ~", often used with children or close friends.
わからなかったら、自分で調べてごらん。
If you don't understand, try looking it up yourself.
おいしいから一口食べてごらん。
It's delicious, so try a bite.
できるかどうか、まずやってごらんなさい。
Try doing it first and see whether you can.
2A casual way of telling someone to look, a shortened form of ごらんなさい.
ほら、あそこに虹が出ているよ、ごらん。
Look, there's a rainbow over there!
こっちにおいで、面白いものがあるからごらん。
Come over here and look, there's something interesting.
3An honorific noun for "seeing" or "watching," commonly used in set phrases like ご覧になる ("to see," honorific) and ご覧ください ("please look").
こちらの資料をご覧ください。
Please take a look at this document.
詳しくは公式サイトをご覧になってください。
Please see the official website for more details.
お客様、こちらのメニューをご覧いただけますか。
Sir/Madam, could you please take a look at this menu?
先生は生徒の作品をご覧になって、感心していた。
The teacher looked at the students' work and was impressed.