Pronunciation: [kɹˈɒs hˈɑːt] (IPA) 
The spelling of "cross heart" follows standard English spelling rules. "Cross" is spelled with a silent final "s", while "heart" is spelled with a silent final "t". The pronunciation of "cross heart" is /krɒs hɑːt/. The "r" in "cross" and "heart" is pronounced with a slight emphasis, while the "o" in "cross" is pronounced with a short vowel sound. The stress is placed on the first syllable of each word.
Cross heart is a colloquial term used to describe a gesture or action in which a person places their hand over their heart, with two fingers crossed or intertwined. This gesture is typically seen as an insincere or disingenuous way of expressing emotions or making a promise. The crossed fingers signify an attempt to deceive or give a false impression, often used as a means of disguising or negating the true intentions behind one's words or actions.
The term "cross heart" can also be used metaphorically to describe a feeling or state of mind. It implies a conflict between one's heartfelt desires and their perceived obligations or responsibilities. In this sense, a person with a cross heart may be torn between two contrasting feelings or choices, finding themselves in a state of emotional turmoil or indecision.
The concept of cross heart can be traced back to superstitious beliefs and gestures commonly performed to ward off bad luck or evil spirits. It has evolved throughout time to encompass the notion of making secret wishes or promises, often associated with youthful innocence or playful deception. While the term may vary in usage and interpretation in different cultures or contexts, cross heart generally conveys the idea of duplicity, internal conflict, or a mixed expression of emotions.
The phrase cross my heart or cross your heart is used as an emphatic statement to show sincerity or honesty. The phrase originated in the late 19th century and is derived from the gesture of crossing one's chest or heart with a finger or hand while making a promise or pledge.
The word cross itself has a much older etymology. It comes from the Old English word cros or crucifix, which is derived from the Latin word crux. The Latin word ultimately traces back to the Proto-Indo-European root ker, which means to turn or to bend. This root is also related to words like curve and crook.
Over time, the gesture of crossing oneself or one's heart became associated with making solemn vows, oaths, or promises, hence the expression cross my heart.
