The term BABY-SIT, E.G. can be solved by the four letter word TEND. To TEND means to take care of or look after something or someone. In this case, it is referring to baby-sitting, which is the act of looking after a child or children for a period of time. This job is usually done by an older person, such as a teenager or adult, and involves activities such as playing with the child, feeding them, and putting them to bed.