the.com/maintenance
The boring vigilance that prevents the exciting disaster.
means The ongoing work of keeping something functional, by repairing, servicing, or preserving it before it breaks.
from From Old French maintenir, to hold in the hand — Latin manu tenere, literally keeping a grip on things so they do not fall apart.
Costs moreDeferred upkeep balloons into pricier emergency repair.
Legal senseOnce meant illegally funding another's lawsuit.
Relationship slangHigh-maintenance describes people, not just machines.