bound form; covered form
In Japanese morphology, the form of a morpheme that appears when another element follows, e.g. the stem form before an auxiliary. Contrasts with 露出形 (exposed form).
See also: 露出形
The bound form of the verb 書く is 書き, as used in 書きたい.
In Japanese morphology, the distinction between bound form and exposed form is important.
Compound of 被覆 (covering) and 形 (form), likely a calque from Western linguistic terminology.