The term 'closely follow' can be represented by the crossword solutions of SHADOW, DOG, TAIL, TRACK, and tailgate. SHADOW is a verb meaning to follow someone closely, usually in a secretive manner. DOG is a verb meaning to follow or pursue closely. TAIL is a verb meaning to follow someone or something closely. TRACK is a verb meaning to follow the course or trail of someone or something. Tailgate is a verb meaning to follow another vehicle too closely.