noun
A basic knot used to join two ropes of equal thickness; known for its flat, symmetrical shape. Often contrasted with 小間結び (granny knot).
See also: 小間結び (こまむすび)
キャンプでロープを固結びでつないだ。
I joined the ropes with a reef knot at camp.
固結びは、ほどけにくい結び方の一つです。
The reef knot is one of the knots that is hard to come undone.
A granny knot, which is similar to a reef knot but less secure and tends to slip. 固結び is the correct, secure version.
Compound of 固 (kata, 'firm, hard') + 結び (musubi, 'knot'). The reading かたむすび is a straightforward combination of the kun'yomi readings.