store up

phrasal verb
1
to not deal with problems when you have them, especially when this causes problems later
انباشتن مشکلات, انباشت کردن, تلمبار کردن
2
to not express strong feelings, especially negative feelings, so that they get even stronger and cause problems later
سرکوب احساسات, فرو خوردن, جمع کردن احساسات
She had stored up all her anger and eventually snapped.