\linebreak[number]
The \linebreak
command tells LaTeX to break the current line at the
point of the command. With the optional argument, number, you can
convert the \linebreak
command from a demand to a request. The number
must be a number from 0 to 4. The higher the number, the more
insistent the request is.
The \linebreak
command causes LaTeX to stretch the line so it extends
to the right margin.