Is this an actual phrase, "Sao Wei Deng Yi Xia" (please wait a moment)?
稍微等一下

MDBG


  稍微
  
  shāo​wēi​
  
  a little bit
  
  HSK 4


Here's a more detailed entry from Tuttle


  稍微
  
  [comp: 稍 slight + 微 tiny]
  
  ADV
  
  slightly, just a little bit
  
  你能不能把电视机的声音开得稍微大一点? 
  Nǐ néng bu néng bǎ diànshìjī de shēngyin kāi de shāowēi dà yìdiǎn?
  Could you turn the TV up a bit? 
  
  我稍微有点儿头疼, 休息一会儿就会好的。 
  Wǒ shāowēi yǒu diǎnr tóuténg, xiūxi yíhuìr jiù huì hǎo de.
  I've a slight headache. I'll be all right after a short rest. 




MoE's entry for 等一下 has the following example sentence:


  如：「吳醫師馬上就會來為您診斷病情，請您稍微等一下。」


Taiwan's Ministry of Education certainly thinks that 稍微等一下 is a common phrase.