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In this article, all rings are commutative with nonzero identity. Let $M$ bean $R$-module. A proper submodule $N$ of $M$ is called a classical primesubmodule, if for each $m\in M$ and elements $a,b\in R$, $abm\in N$ impliesthat $am\in N$ or $bm\in N$. We introduce the concept of "classical 2-absorbingsubmodules" as a generalization of "classical prime submodules." We say that aproper submodule $N$ of $M$ is a classical 2-absorbing submodule if whenever$a,b,c\in R$ and $m\in M$ with $abcm\in N$, then $abm\in N$ or $acm\in N$ or$bcm\in N$.

Classical 2-absorbing submodules of modules over commutative rings