\enlargethispage ¶Synopsis, one of:
\enlargethispage{size}
\enlargethispage*{size}
Enlarge the \textheight for the current page. The required
argument size must be a rigid length (see Lengths). It may be
positive or negative. This command is fragile (see \protect).
A common strategy is to wait until you have the final text of a document, and then pass through it tweaking line and page breaks. This command allows you some page size leeway.
This will allow one extra line on the current page.
\enlargethispage{\baselineskip}
The starred form \enlargesthispage* tries to squeeze the material
together on the page as much as possible, for the common use case of
getting one more line on the page. This is often used together with an
explicit \pagebreak.