look it up in a dictionary
辞書で調べてごらん。
Try looking it up in the dictionary.
それを辞書で調べてみなさい。
Look it up in the dictionary.
その単語を辞書で調べてごらん。
Look up that word in the dictionary.
辞書で調べてみるね。
I'll look it up in the dictionary.
その単語、自分で辞書で調べてごらん。
Try looking up that word in the dictionary yourself.
分からない単語は辞書で調べてね。
Look up any words you don't know in the dictionary.