A drop in the bucket
Meaning
A very small part of something much larger.
Usage
Used when a contribution is too little to make a noticeable difference.
Origin & History
Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.
Water metaphor describing a single drop compared with a large container.
Used to temper expectations when discussing small contributions.