To store up is to save for later, or to build up trouble ahead. Store up the harvest.
The second sense is always a warning, since what is stored up is a problem. To store up trouble means the cost is delayed rather than avoided.
1phrasestore upTo save for later, or to build up trouble ahead.
“Ignoring the damp will store up trouble for the whole terrace.”
store up is a phrase.
Practised in Phrasal Verbs