jí​yè​chéng​qiú

many a little makes a mickle

Senses

集腋成裘 jí​yè​chéng​qiú (also jí​yì​chéng​qiú) many a little makes a mickle

Literally meaning to make a fur coat by collecting small bits of fur from many foxes' armpits, this idiom describes how many small contributions add up to something big; similar to 积少成多 jī​shǎo​chéng​duō.

References

synonym 集腋成裘/集腋成裘 积少成多/積少成多
synonym 聚沙成塔/聚沙成塔 集腋成裘/集腋成裘