  In this article we study definable functions in tame expansions of
algebraically closed valued fields. For a given definable function we have two
types of results: of type (I), which hold at a neighborhood of infinity, and of
type (II), which hold locally for all but finitely many points in the domain of
the function. In the first part of the article, we show type (I) and (II)
results concerning factorizations of definable functions over the value group.
As an application, we show that tame expansions of algebraically closed valued
fields having value group $\mathbb{Q}$ (like $\mathbb{C}_p$ and
$\overline{\mathbb{F}_p}^{alg}(\!(t^\mathbb{Q})\!)$) are polynomially bounded.
In the second part, under an additional assumption on the asymptotic behavior
of unary definable functions of the value group, we extend these factorizations
over the residue multiplicative structure $\mathrm{RV}$. In characteristic 0,
we obtain as a corollary that the domain of a definable function $f\colon
X\subseteq K\to K$ can be partitioned into sets $F\cup E\cup J$, where $F$ is
finite, $f|E$ is locally constant and $f|J$ satisfies locally the Jacobian
property.
