narrow eyes; half-open eyes
Describes eyes that are narrowed, squinting, or not fully open. Often used with verbs like する or になる.
He narrowed his eyes as if the light were too bright.
fine mesh; fine texture; tight weave
Refers to a fine or dense structure, such as a sieve, fabric, or file. The gloss 'smooth cut (of a file)' is a technical use.
猫が気持ちよさそうに細目になっている。
The cat has its eyes half-closed, looking comfortable.
This net has a fine mesh, so even small insects can't escape.
Finish it with a smooth-cut file.