hang back

US /hæŋ bæk/
UK /hæŋ bæk/
"hang back" picture
1.

退缩, 犹豫

to hesitate or be reluctant to do something, especially because of shyness or caution

:
Don't hang back, join the dance!
退缩,加入舞蹈吧!
She tends to hang back in social situations.
她在社交场合往往会退缩