Synonyms of 'add to something'
in the sense of multiply
to increase or cause to increase in number, quantity, or degree
Her husband multiplied his demands on her time.
in the sense of proliferate
to increase rapidly in numbers
Courses in creative writing have proliferated in recent years.
in the sense of raise
to increase in amount, quality, or intensity
Two incidents in recent days have raised the level of concern.
in the sense of spread
to extend over a larger expanse
The sense of fear is spreading in residential neighbourhoods.
Thesaurus for add to something from the Collins English Thesaurus