back
1.
to prevent a feeling, etc. from being expressed
SYN restrain :
She was unable to keep back her tears.
2.
to continue to have a part of sth :
He kept back half the money for himself.
back
1.
to prevent a feeling, etc. from being expressed
SYN restrain :
She was unable to keep back her tears.
2.
to continue to have a part of sth :
He kept back half the money for himself.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005