sidelong glance; looking sideways
A glance directed to the side without turning one's head; often implies a furtive or casual look.
He glanced at me sideways.
I stole a sidelong glance at the clock.
short grain (paper)
Refers to paper grain where the fibers run horizontally (short direction). Often contrasted with 縦目 (long grain). Commonly written as ヨコ目 in this context.
See also: 縦目
This paper is short grain, so it creases easily.
kanji 'net' radical at top (罒)
Refers to the radical 罒 (あみがしら) when it appears at the top of a kanji, as in 罪 or 署. A specialized term used in kanji description.
See also: あみがしら
The top part of 罪 is a radical called 横目.
She glanced sideways at the man in the next seat.
Brushing aside the opposition around him, he pressed ahead with the plan.
She gave him a sidelong glance to check his reaction.
網頭 is the standard technical name for the 罒 radical at the top of a kanji, while 横目 is an alternative name for the same radical based on its horizontal, eye-like shape.
横目 refers to glancing sideways with just the eyes without turning the head, often furtively, whereas 脇見 refers to momentarily looking away from what one should be attending to, as when driving.
Compound of 横 (side, horizontal) and 目 (eye, grain, pattern). The 'sidelong glance' sense is literal; the paper grain sense derives from the horizontal orientation; the radical sense comes from the shape resembling a sideways eye or net.