恭 is a bound form (黏着语素) that never appears alone in modern Chinese. It combines with another character to form words expressing respect, politeness, or reverence, such as 恭喜 (gōngxǐ 'congratulations'), 恭敬 (gōngjìng 'respectful'), 恭候 (gōnghòu 'to wait respectfully'), and 恭维 (gōngwei 'to flatter'). When you encounter 恭, expect it to be the first half of a two-syllable expression.