slight mistake; minor error
A small, often forgivable mistake or oversight. Not used for serious errors.
小過を見逃して、大きなミスだけを指摘した。
I overlooked the minor mistakes and only pointed out the big errors.
Xiao Guo; Preponderance of the Small
Compound of 小 (small) and 過 (error, fault). The exact historical derivation is uncertain, but the meaning is transparent from its components.