敞 is a bound morpheme (b.f.) that cannot stand alone as a word. It appears as part of common two-character words such as 宽敞 (kuānchang, spacious), 敞开 (chǎngkāi, to open wide), and 敞亮 (chǎngliàng, spacious and bright / clear in mind). When you see 敞, think of the concept of “openness” or “spaciousness” in compound words.