bottle up feelings, to

To  hold  one’s  emotions  under  tight  control. This metaphor  for  containing  oneself  dates  from  the  mid-nineteenth  century, although  by  the  early  1600s  the  term “bottling  up” had  been  transferred  to containing things other than liquid in bottles (for example, “Vapours bottl’d up in cloudes,” T. Scott, 1622).