名詞 mix up:

1. a mistake that results from taking one thing to be another
   同義詞：confusion, mix-up

動詞 mix up:

1. assemble without order or sense
   同義詞：jumble, confuse
2. cause to be perplexed or confounded
   同義詞：stump

1. Don't mix up this pair of synonyms.
   別把這兩個同義詞混淆了。
2. Please don't mix up my papers.
   請不要把我的公文弄混淆了。
3. Never mix up these two words.
   千萬別把這兩個詞相混淆。