How Do You Spell RUSHING UP ON?
Pronunciation: [ɹˈʌʃɪŋ ˌʌp ˈɒn] (IPA) 
The phrase "brushing up on" is commonly misspelled as "rushing up on". The correct spelling is "brushing", with the IPA phonetic transcription of /ˈbrʌʃɪŋ/. The "rushing" spelling may be influenced by similar sounding words like "rushing" or "crushing". To brush up on a skill means to review or refresh one's knowledge of it. So, next time you want to brush up on a skill, make sure you're not rushing to spell it incorrectly!
