hold back

引き留める、思いとどまらせる、感情を抑える、思いとどまる、何かをするのをためらう

Ex

  • Amy has a great voice but whenever she’s singing in public she feels shy and holds back.
  • I can feel that he’s holding back.

Reference source

  • https://kskszk.blog.so-net.ne.jp/2014-05-27
  • https://dictionary.goo.ne.jp/word/en/hold+back/