very thin, as thin as a hair
A fishing line made from hair.
The line along one's forehead where hair starts growing.
A very thin line in writing, drawing, or typography.
A very thin fissure.
Not flabby; firm, toned; (of a person) having a lean, strong body.
Containing only relevant parts; brief and controlled.
Experiencing anxiety or stress.
Under tension, like a stretched bowstring, rope, or sail; tight.
Strong; uncompromising.
Neat and well-disciplined; (by extension) efficient and in order.
To make taut; to tauten, to tighten.