Sentence:  My seven-year-old son always <WSD>digs</WSD> a hole in the middle of his mashed potatoes and fills it with gravy before he starts to eat them. 
Meaning of the word marked with <WSD> tags:  To move hard-packed earth out of the way, especially downward to make a hole with a shovel. Or to drill, or the like, through rocks, roads, or the like. More generally, to make any similar hole by moving material out of the way.(should this be split into senses?)