The phrase "stop suckling" refers to the act of ceasing to breastfeed or nurse. There are several synonyms for this term, including wean, withdraw, detach, and disengage. Weaning refers to gradual withdrawal from breastfeeding, while detach and disengage imply a more immediate separation. Other related terms include abstain, refrain, and desist, which are used to describe stopping a certain behavior or action altogether. It's essential to remember that these words are not interchangeable, and their usage depends on the specific context and tone of the message being conveyed.