noun
elbow rest; arm rest; elbow pad
Refers to a detachable cushion or pad that supports the elbow, often used on chairs or desks.
この椅子には肘当てが付いています。
This chair comes with elbow rests.
長時間のデスクワークには肘当てがあると楽だ。
Having an elbow pad makes long desk work more comfortable.
noun
Martial arts term for a strike delivered with the elbow, especially in karate.
空手の試合で肘当てが決まった。
An elbow strike landed in the karate match.
Compound of 肘 (hiji, 'elbow') and 当て (ate, 'pad' or 'strike'). The meaning depends on context: a protective pad or a martial arts strike.