Sentence:  To <WSD>connect the dots</WSD>, use a pen or pencil and draw a line from dot 1 to dot 2, from dot 2 to dot 3 and so on until all the dots are connected. You can try to guess  what kind of animal is shown in the picture before you connect the dots. 
Meaning of the word marked with <WSD> tags:  To attempt to complete a puzzle in which dots on a paper must be connected in a specific order so that the joining lines form a picture.