A drop in the bucket/ocean
This idiom later evolved into ‘a drop in the ocean’. In The Edinburgh Weekly Journal (1802), it says: ‘The votes for the appointment of Bonaparte to be Chief Consul for life are like a drop in the ocean compared with the aggregate of the population of France.’
I try to read a book every month, but that’s just a drop in the bucket compared with how much some of my classmates read.
My donation may seem like just a drop in the bucket, but every drop counts!
My boss Jason gets paid £100,000 every year, but that’s just a drop in the ocean compared with what some of the other managers earn.