Boyd’s Bible Dictionary:

The Eastern mode of salutation by kneeling on one knee and bending the head forward (Gen. 37:10; 1 Kings 1:53; 2:19).

Concise Bible Dictionary:

The common weapon for discharging arrows. It is used symbolically for the hidden attacks of the wicked against the righteous (Psa. 11:2; Psa. 37:14-15). A “bow of steel” signifies great strength (Job 20:24). The wicked are like a “deceitful bow,” one that breaks when it is depended upon (Psa. 78:57; Hos. 7:16). In 2 Samuel 1:18 David’s elegy on Saul and Jonathan is called “The Bow.” The children were taught “[the song of] the Bow” (RV).

From Manners and Customs of the Bible:

2 Kings 13:15. Elisha said unto him, Take bow and arrows. And he took unto him bow and arrows.
1. The bow is a very ancient weapon, and early mention is made of it in the Bible. Ishmael became an archer (Gen. 21:20). Isaac sent Esau to get venison by means of the bow (Gen. 27:3). It also came into early use as a weapon of war (Gen. 48:22). Bows were made of various materials: wood, horn, and even ivory, were used. Sometimes the wood and horn were united in the bow, the wood being backed with horn. Metallic bows were also used. See Job 20:24; Psalm 18:34. Bows were of various shapes. The Egyptian bow—a round piece of wood from five feet to five and a half long—was either nearly straight, with a slight curve at each end, or else showed a deep curve in the center when unstrung.
Assyrian bows were sometimes curved and sometimes angular. They were shorter than the Egyptian bows. The strings of ancient bows were of leather thongs, horse hair, hide, or catgut. Various modes were adopted for bending the bow, the hand, the knee, or the foot being used. It was probably most usually bent by the aid of the foot, since darak, the word commonly used in speaking of bending the bow, literally means to “tread.”
2. The arrows were made of reed or wood and tipped with metal or horn. They were sometimes feathered, though not always. From Psalm 38:2, we infer that they sometimes had barbed points.