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1. Of a container or vessel, to fill up (with liquid or an emotion) past the point of overflowing. The drainage ditches across the city have begun welling over as the heavy rains continue. Her eyes welled over and tears rolled down her cheeks as she watched him walk away.
2. Of a liquid or emotion, to fill up (a container or vessel) past the point of overflowing. Water began welling over after Jonathan forgot to turn the taps of the sink off. People's fury welled over into violent protests across the country after the government announced its extreme new policies.
[for a liquid] to fill up and spill over. The laundry tub finally welled over as it became too full. The milk glass began to well over, and Timmy began to cry.
1. To build up and overflow the boundaries of a container: I left the tap on, and the water in the bathtub welled over and spilled onto the floor. Tears welled over and ran down my cheeks. My anger welled over, and I yelled out.
2. To become filled and overflow: My eyes welled over with tears. My heart welled over with joy.