DuckCorp Dico

Found 2 definitions

1.                 From English-日本語 (にほんご) FreeDict+WikDict dictionary ver. 2022.11.18:
                   
   
   
                   
                     
   flat //flæt// <adj>
   1. 平, 平坦, 扁平
   having no variations in altitude
   2. 変
   lowered by one semitone
   3. パンクする
   of a tyre: deflated
   4. 平板
   without variations in pitch
   
                   
                 

2.                 From English-日本語 (にほんご) FreeDict+WikDict dictionary ver. 2022.11.18:
                   
   
   
                   
                     
   flat //flæt// <n>
   1. パンク
   flat tyre/tire
   2. フラット, 変
   music: note played a semitone lower than a natural