expression, godan verb (-ku)
pride comes before a fall; arrogance leads to downfall; every flow has its ebb
A proverb warning that overconfidence, arrogance, or being too full of oneself invites loss or failure. The literal image is that fullness (満) brings loss (損). The English gloss 'every flow has its ebb' is a more general equivalent, but the core Japanese nuance is about pride.
If you get carried away just because you succeeded, as the saying goes 'pride comes before a fall,' you'll fail someday.