small potatoes

big fish in a small pond

One who has achieved a high rank or is highly esteemed, but only in a small, relatively unimportant, or little known location or organization.

in no small measure

To a very great extent.

in no small part

Synonym of in no small measure.

one small step for man, one giant leap for mankind

(used imitatively) A cliché used to exaggerate an accomplishment or milestone.

sing small

To assume a humble tone.

small change

A minor or insignificant amount of money.

small dick energy

A lack of self-confidence; timidity, diffidence.

small fry

One or more relatively small and insignificant individuals or things of relatively little consequence, importance, or value.