"Worming in to" is a phrase that is usually used to describe someone or something trying to infiltrate a group or situation, often with a hidden agenda. Some synonyms for "worming in to" include insinuating, ingratiating, infiltrating, penetrating, integrating, assimilating, and encroaching. Each of these words implies a certain level of subtlety and persistence, as the act of "worming in to" something often requires a delicate balance of charm and determination. Whether used in a positive or negative context, these synonyms can help to convey the sense of someone or something trying to gain a foothold in a particular situation or group.