The Spanish verb 'ansiar' (to yearn for, to crave) comes from the Latin verb 'anxiāre' meaning 'to make anxious' or 'to trouble'. The evolution from Latin to Spanish shows both a phonetic and semantic shift. Phonetically, the Latin 'x' sound transformed into 's' in Spanish, a common sound change between these languages. Semantically, the meaning evolved from causing anxiety or trouble to expressing an intense desire or craving - the connection being that both strong anxiety and intense yearning can create a similar state of emotional disturbance or restlessness.

A common related Spanish word is 'ansia' (anxiety, anguish, eagerness), which is the noun form directly related to 'ansiar'. Another related term is 'ansioso/a' (anxious, eager), which maintains both the anxiety-related and desire-related meanings. These words form a family that connects feelings of anxiety with strong desire or eagerness.

English speakers can easily connect 'ansiar' to the English word 'anxious' and 'anxiety', which share the same Latin root. While the English words maintained the meaning of worry or unease more strictly, the Spanish 'ansiar' shifted to emphasize the feeling of intense desire or craving. Understanding this connection can help English speakers remember that 'ansiar' describes a feeling so strong it creates a kind of emotional restlessness, similar to anxiety.