Definitions
1.nounA short-range flow of water returning seaward from the waves breaking on the shore."A strong undertow may sweep a returning swimmer off their feet but it does not carry them far from the shore."
2.noun(by extension) A feeling that runs contrary to one's normal one.
3.verbTo pull or tow under; drag beneath; pull down.
4.verbTo pull down by, or as by, an undertow.
5.verbTo flow or behave as an undertow.