Cap in hand is an idiomatic expression which means to be subservient or humble in one's request. It implies that the person is asking for something with respect and in a modest way to gain someone's favor. There are several alternative phrases that express the same idea. For example, being "submissive," "deferential," "meek," "servile," "ingratiating," "obsequious," "pliant," or "unassertive." Similarly, terms like "begging," "pleading," "imploring," and "supplicating," all mean requesting something humbly or earnestly. Regardless of the word that is used, these expressions indicate a willingness to submit oneself to another person's will and to ask for help or favors in a polite and respectful way.